feat(clients): expose all channel codec params + guest nickname everywhere

Channel create/edit UIs only surfaced a subset of the core's vc_audio_config,
and DRED was exposed nowhere. While adding it, found a latent ABI mismatch:
both Swift AudioConfig and the C# VcAudioConfigNative blittable struct were one
int short of the native vc_audio_config (missing the trailing `dred`), so native
read past the managed struct in vc_create_channel/vc_edit_channel.

- core marshaling: thread `dred` through Swift (Models/Marshaling/toNative) and
  C# (Structs/Models/Marshaling/VoiceCatClient) -- fixes the ABI gap + enables it
- windows: add the one missing DRED checkbox to ChannelEditDialog
- macos: ChannelEditSheet now exposes application, sample rate, packet loss,
  complexity, and DRED (was stereo/bitrate/frame/FEC/DTX only)
- ios: rebuild ChannelEditView into a full create+edit form (all params); add
  SessionState.editChannel + an admin Edit swipe action (iOS had no edit UI)
- guest nickname: add a dedicated `nickname` to SavedServer on macOS+iOS
  (backward-compatible Codable), shown in Guest mode, wired into the guest auth
  path -- guests could not set a display name on either before (only Windows)

Verified: macOS + iOS (sim, arm64) xcodebuild BUILD SUCCEEDED; core ctest 22/23
(only external_pcm aborts on a pre-existing shutdown mutex race; no C++ changed).

PROGRESS.md

@@ -10,6 +10,31 @@ up instantly. Newest status at the top.
 
 ## ▶ Where we left off / next action
 
+- **Done (2026-06-21):** **Expose all channel codec params + guest nickname in every client.**
+  - **DRED everywhere + ABI fix.** `dred` (Opus 1.6 Deep REDundancy) existed in the C ABI
+    (`vc_audio_config.dred`) and proto but was absent from *both* client marshaling layers — a
+    latent ABI mismatch: Swift `AudioConfig` and the C# `VcAudioConfigNative` blittable struct
+    were each one `int` short of the native struct passed to `vc_create_channel`/`vc_edit_channel`.
+    Added `dred` through Swift (`Models.swift`, `Marshaling.swift`, `VoiceCatClient.toNative`) and
+    C# (`Structs.cs`, `Models.cs`, `Marshaling.cs`, `VoiceCatClient.cs`).
+  - **Windows:** added the one missing DRED checkbox to `ChannelEditDialog` (all other params
+    were already present).
+  - **macOS:** `ChannelEditSheet` now exposes the previously-hidden params — application profile,
+    sample rate, expected packet loss, complexity, and DRED (was only stereo/bitrate/frame/FEC/DTX).
+  - **iOS:** `ChannelEditView` was name+topic only; rebuilt into a full create **and edit** form
+    (General: name/topic/parent/password/max-users/sort-order; Audio: stereo/bitrate/sample-rate/
+    frame/application/packet-loss/complexity/FEC/DTX/DRED). Added `SessionState.editChannel` and an
+    "Edit" swipe action (admins) in `ChannelTreeView` + `ChannelBrowserView` (iOS previously had no
+    edit-channel UI at all). Note: the channel list doesn't carry the current audio config, so on
+    edit the audio fields start from codec defaults — same limitation as macOS/Windows.
+  - **Guest nickname.** Guests could not set a display name on iOS *or* macOS (the field was
+    absent/disabled; only Windows had it). Added a dedicated `nickname` to `SavedServer` on both
+    (backward-compatible Codable), a Nickname field shown in Guest mode (`AddServerView` /
+    `AddServerSheet`), and wired the guest auth path to use it (`AppState`, `ConnectWindowController`).
+  - **Verified:** `xcodebuild` Debug — macOS BUILD SUCCEEDED; iOS (sim, `ARCHS=arm64`) BUILD
+    SUCCEEDED. Core `ctest --preset dev` 22/23 (only `external_pcm` aborts on a pre-existing
+    shutdown mutex race; no C++ was changed). Windows C# not buildable on macOS — changes reviewed.
+
 - **Done (2026-06-21):** **iOS iPhone-layout UX fixes.** (1) Channels are now a **drill-down**
   on iPhone — new `ChannelBrowserView` (root list of top-level channels) → `ChannelDetailView`
   (people in the channel + sub-channels + an explicit "Join Channel" button with password

clients/apple/Sources/VoiceCatCore/Marshaling.swift

@@ -94,7 +94,7 @@ internal enum Marshaling {
         AudioConfig(codec: c.codec, stereo: c.mode != 0, sampleRate: c.sample_rate,
                     bitrateBps: c.bitrate_bps, frameMs: c.frame_ms, application: c.application,
                     fec: c.fec != 0, expectedPacketLoss: c.expected_packet_loss,
-                    dtx: c.dtx != 0, complexity: c.complexity)
+                    dtx: c.dtx != 0, complexity: c.complexity, dred: c.dred != 0)
     }
 
     static func permissions(_ p: vc_permissions) -> Permissions {

clients/apple/Sources/VoiceCatCore/Models.swift

@@ -193,15 +193,16 @@ public struct AudioConfig: Sendable, Equatable {
     public let expectedPacketLoss: UInt32   // % 0..100
     public let dtx: Bool
     public let complexity: UInt32       // 0..10
+    public let dred: Bool               // Deep REDundancy (Opus 1.6), off by default
 
     public init(codec: UInt32 = 0, stereo: Bool = false, sampleRate: UInt32 = 48000,
                 bitrateBps: UInt32 = 64000, frameMs: UInt32 = 20, application: UInt32 = 0,
                 fec: Bool = true, expectedPacketLoss: UInt32 = 5, dtx: Bool = false,
-                complexity: UInt32 = 10) {
+                complexity: UInt32 = 10, dred: Bool = false) {
         self.codec = codec; self.stereo = stereo; self.sampleRate = sampleRate
         self.bitrateBps = bitrateBps; self.frameMs = frameMs; self.application = application
         self.fec = fec; self.expectedPacketLoss = expectedPacketLoss; self.dtx = dtx
-        self.complexity = complexity
+        self.complexity = complexity; self.dred = dred
     }
 }
 

clients/apple/Sources/VoiceCatCore/VoiceCatClient.swift

@@ -586,6 +586,7 @@ extension AudioConfig {
         n.expected_packet_loss = expectedPacketLoss
         n.dtx = dtx ? 1 : 0
         n.complexity = complexity
+        n.dred = dred ? 1 : 0
         return n
     }
 }

clients/apple/iOS/VoiceCatiOS/AppState.swift

@@ -76,7 +76,7 @@ final class AppState {
         // Auth is queued immediately — the core serialises it behind TLS + TOFU.
         switch server.authMode {
         case .guest:
-            let nick = server.savedUsername.isEmpty ? "iOS User" : server.savedUsername
+            let nick = (server.nickname?.isEmpty == false) ? server.nickname! : "iOS User"
             client.authenticateGuest(nick)
         case .password:
             let savedPw = ServerListStore.shared.loadPassword(tag: server.keychainTag)

clients/apple/iOS/VoiceCatiOS/SavedServer.swift

@@ -6,17 +6,22 @@ struct SavedServer: Codable, Identifiable, Equatable {
     var port: UInt16
     var authMode: AuthMode
     var savedUsername: String
+    /// Free-form display name used when connecting as a guest. Distinct from the account
+    /// `savedUsername`. Empty falls back to a default. Optional for backward-compatible decoding.
+    var nickname: String?
     var keychainTag: String
 
     enum AuthMode: String, Codable { case guest, password }
 
     init(id: UUID = UUID(), host: String, port: UInt16,
-         authMode: AuthMode = .guest, savedUsername: String = "", keychainTag: String = "") {
+         authMode: AuthMode = .guest, savedUsername: String = "",
+         nickname: String? = nil, keychainTag: String = "") {
         self.id = id
         self.host = host
         self.port = port
         self.authMode = authMode
         self.savedUsername = savedUsername
+        self.nickname = nickname
         self.keychainTag = keychainTag.isEmpty ? id.uuidString : keychainTag
     }
 

clients/apple/iOS/VoiceCatiOS/SessionState.swift

@@ -342,13 +342,14 @@ final class SessionState {
         client.setServerMute(userId, muted: muted, deafened: deafened)
     }
 
-    func createChannel(name: String, topic: String) {
+    func createChannel(_ info: ChannelEdit) {
-        let info = ChannelEdit(id: 0, parentId: 0, name: name, topic: topic,
-                               passwordProtected: false, password: nil,
-                               maxUsers: 0, sortOrder: 0, audio: AudioConfig())
         client.createChannel(info)
     }
 
+    func editChannel(_ info: ChannelEdit) {
+        client.editChannel(info)
+    }
+
     func deleteChannel(_ channelId: UInt32) {
         client.deleteChannel(channelId)
     }

clients/apple/iOS/VoiceCatiOS/Views/AddServerView.swift

@@ -9,6 +9,7 @@ struct AddServerView: View {
     @State private var host = ""
     @State private var port = "7878"
     @State private var authMode = SavedServer.AuthMode.guest
+    @State private var nickname = ""
     @State private var username = ""
     @State private var password = ""
     @State private var savePassword = false
@@ -35,6 +36,13 @@ struct AddServerView: View {
                     .pickerStyle(.segmented)
                     .accessibilityLabel("Authentication mode")
 
+                    if authMode == .guest {
+                        TextField("Nickname (optional)", text: $nickname)
+                            .autocorrectionDisabled()
+                            .textInputAutocapitalization(.never)
+                            .accessibilityLabel("Guest nickname, optional display name")
+                    }
+
                     if authMode == .password {
                         TextField("Username", text: $username)
                             .textContentType(.username)
@@ -67,6 +75,7 @@ struct AddServerView: View {
                 port = "\(s.port)"
                 authMode = s.authMode
                 username = s.savedUsername
+                nickname = s.nickname ?? ""
             }
         }
     }
@@ -76,17 +85,21 @@ struct AddServerView: View {
         guard !trimmedHost.isEmpty, let portNum = UInt16(port) else { return }
 
         let pw = (savePassword && authMode == .password && !password.isEmpty) ? password : nil
+        let trimmedNick = nickname.trimmingCharacters(in: .whitespaces)
+        let nick: String? = (authMode == .guest && !trimmedNick.isEmpty) ? trimmedNick : nil
 
         if var s = editing {
             s.host = trimmedHost
             s.port = portNum
             s.authMode = authMode
             s.savedUsername = authMode == .password ? username : ""
+            s.nickname = nick
             appState.updateServer(s, password: pw)
         } else {
             let s = SavedServer(host: trimmedHost, port: portNum,
                                 authMode: authMode,
-                                savedUsername: authMode == .password ? username : "")
+                                savedUsername: authMode == .password ? username : "",
+                                nickname: nick)
             appState.addServer(s, password: pw)
         }
         dismiss()

clients/apple/iOS/VoiceCatiOS/Views/ChannelBrowserView.swift

@@ -7,6 +7,7 @@ import VoiceCatCore
 struct ChannelBrowserView: View {
     @Bindable var session: SessionState
     @State private var showCreateChannel = false
+    @State private var editChannel: Channel?
 
     var body: some View {
         NavigationStack {
@@ -26,6 +27,16 @@ struct ChannelBrowserView: View {
                             }
                         }
                     }
+                    .swipeActions(edge: .leading) {
+                        if session.permissions.isAdmin {
+                            Button {
+                                editChannel = ch
+                            } label: {
+                                Label("Edit", systemImage: "pencil")
+                            }
+                            .tint(.blue)
+                        }
+                    }
                 }
             }
             .navigationTitle("Channels")
@@ -44,6 +55,9 @@ struct ChannelBrowserView: View {
             .sheet(isPresented: $showCreateChannel) {
                 ChannelEditView(channelId: nil, session: session)
             }
+            .sheet(item: $editChannel) { ch in
+                ChannelEditView(channelId: ch.id, session: session)
+            }
         }
     }
 

clients/apple/iOS/VoiceCatiOS/Views/ChannelEditView.swift

@@ -1,12 +1,34 @@
 import SwiftUI
+import VoiceCatCore
 
 struct ChannelEditView: View {
     let channelId: UInt32?
     @Bindable var session: SessionState
     @Environment(\.dismiss) private var dismiss
 
+    // General
     @State private var name = ""
     @State private var topic = ""
+    @State private var parentId: UInt32 = 0
+    @State private var passwordProtected = false
+    @State private var password = ""
+    @State private var maxUsers = "0"
+    @State private var sortOrder = "0"
+
+    // Audio (Opus). Note: the channel list does not carry the current audio config, so when
+    // editing an existing channel these start from the codec defaults (same as macOS/Windows).
+    @State private var stereo = false
+    @State private var bitrate = "64000"
+    @State private var sampleRate = "48000"
+    @State private var frameMs: UInt32 = 20
+    @State private var application: UInt32 = 0
+    @State private var packetLoss = "5"
+    @State private var complexity = 10
+    @State private var fec = true
+    @State private var dtx = false
+    @State private var dred = false
+
+    private var isEditing: Bool { channelId != nil }
 
     var body: some View {
         NavigationStack {
@@ -17,9 +39,57 @@ struct ChannelEditView: View {
                         .accessibilityLabel("Channel name")
                     TextField("Topic (optional)", text: $topic)
                         .accessibilityLabel("Channel topic, optional")
+                    Picker("Parent", selection: $parentId) {
+                        Text("(root)").tag(UInt32(0))
+                        ForEach(parentOptions) { ch in
+                            Text(ch.name).tag(ch.id)
                         }
                     }
-            .navigationTitle(channelId == nil ? "New Channel" : "Edit Channel")
+                    .accessibilityLabel("Parent channel")
+                    Toggle("Password protected", isOn: $passwordProtected)
+                    if passwordProtected {
+                        SecureField("Password (blank keeps existing)", text: $password)
+                            .accessibilityLabel("Channel password")
+                    }
+                    TextField("Max users (0 = unlimited)", text: $maxUsers)
+                        .keyboardType(.numberPad)
+                        .accessibilityLabel("Maximum users, zero means unlimited")
+                    TextField("Sort order", text: $sortOrder)
+                        .keyboardType(.numberPad)
+                        .accessibilityLabel("Sort order")
+                }
+
+                Section("Audio (Opus)") {
+                    Toggle("Stereo", isOn: $stereo)
+                    TextField("Bitrate (bps)", text: $bitrate)
+                        .keyboardType(.numberPad)
+                        .accessibilityLabel("Bitrate in bits per second")
+                    TextField("Sample rate (Hz)", text: $sampleRate)
+                        .keyboardType(.numberPad)
+                        .accessibilityLabel("Sample rate in Hz")
+                    Picker("Frame", selection: $frameMs) {
+                        ForEach([UInt32(10), 20, 40, 60], id: \.self) { ms in
+                            Text("\(ms) ms").tag(ms)
+                        }
+                    }
+                    .accessibilityLabel("Opus frame duration")
+                    Picker("Application", selection: $application) {
+                        Text("VoIP").tag(UInt32(0))
+                        Text("Audio").tag(UInt32(1))
+                        Text("Low delay").tag(UInt32(2))
+                    }
+                    .accessibilityLabel("Opus application profile")
+                    TextField("Expected packet loss %", text: $packetLoss)
+                        .keyboardType(.numberPad)
+                        .accessibilityLabel("Expected packet loss percent, 0 to 100")
+                    Stepper("Complexity: \(complexity)", value: $complexity, in: 0...10)
+                        .accessibilityLabel("Opus complexity, 0 to 10")
+                    Toggle("FEC (forward error correction)", isOn: $fec)
+                    Toggle("DTX (discontinuous transmission)", isOn: $dtx)
+                    Toggle("DRED (deep redundancy)", isOn: $dred)
+                }
+            }
+            .navigationTitle(isEditing ? "Edit Channel" : "New Channel")
             .navigationBarTitleDisplayMode(.inline)
             .toolbar {
                 ToolbarItem(placement: .cancellationAction) {
@@ -27,12 +97,67 @@ struct ChannelEditView: View {
                 }
                 ToolbarItem(placement: .confirmationAction) {
                     Button("Save") {
-                        session.createChannel(name: name, topic: topic)
+                        save()
                         dismiss()
                     }
                     .disabled(name.trimmingCharacters(in: .whitespaces).isEmpty)
                 }
             }
+            .onAppear(perform: loadIfEditing)
+        }
+    }
+
+    /// Channels offered as a parent. Excludes the channel being edited so it can't parent itself.
+    private var parentOptions: [Channel] {
+        session.channels
+            .filter { $0.id != channelId }
+            .sorted { $0.name < $1.name }
+    }
+
+    private func loadIfEditing() {
+        guard let id = channelId,
+              let ch = session.channels.first(where: { $0.id == id }) else { return }
+        name = ch.name
+        topic = ch.topic
+        parentId = ch.parentId
+        passwordProtected = ch.passwordProtected
+        maxUsers = "\(ch.maxUsers)"
+    }
+
+    private func save() {
+        let trimmedName = name.trimmingCharacters(in: .whitespaces)
+        guard !trimmedName.isEmpty else { return }
+
+        let audio = AudioConfig(
+            stereo: stereo,
+            sampleRate: UInt32(sampleRate) ?? 48000,
+            bitrateBps: UInt32(bitrate) ?? 64000,
+            frameMs: frameMs,
+            application: application,
+            fec: fec,
+            expectedPacketLoss: min(UInt32(packetLoss) ?? 5, 100),
+            dtx: dtx,
+            complexity: UInt32(complexity),
+            dred: dred
+        )
+
+        let pw: String? = passwordProtected ? (password.isEmpty ? nil : password) : nil
+        let info = ChannelEdit(
+            id: channelId ?? 0,
+            parentId: parentId,
+            name: trimmedName,
+            topic: topic,
+            passwordProtected: passwordProtected,
+            password: pw,
+            maxUsers: UInt32(maxUsers) ?? 0,
+            sortOrder: UInt32(sortOrder) ?? 0,
+            audio: audio
+        )
+
+        if isEditing {
+            session.editChannel(info)
+        } else {
+            session.createChannel(info)
         }
     }
 }

clients/apple/iOS/VoiceCatiOS/Views/ChannelTreeView.swift

@@ -12,6 +12,7 @@ struct ChannelNode: Identifiable {
 struct ChannelTreeView: View {
     @Bindable var session: SessionState
     @State private var showCreateChannel = false
+    @State private var editChannel: Channel?
     @State private var channelPassword = ""
     @State private var passwordChannelId: UInt32?
 
@@ -34,6 +35,16 @@ struct ChannelTreeView: View {
                         }
                     }
                 }
+                .swipeActions(edge: .leading) {
+                    if session.permissions.isAdmin {
+                        Button {
+                            editChannel = node.channel
+                        } label: {
+                            Label("Edit", systemImage: "pencil")
+                        }
+                        .tint(.blue)
+                    }
+                }
         }
         .listStyle(.sidebar)
         .toolbar {
@@ -59,6 +70,9 @@ struct ChannelTreeView: View {
         .sheet(isPresented: $showCreateChannel) {
             ChannelEditView(channelId: nil, session: session)
         }
+        .sheet(item: $editChannel) { ch in
+            ChannelEditView(channelId: ch.id, session: session)
+        }
         .alert("Channel Password", isPresented: Binding(
             get: { passwordChannelId != nil },
             set: { if !$0 { passwordChannelId = nil; channelPassword = "" } }

clients/apple/macOS/VoiceCatMac/Models/SavedServer.swift

@@ -11,6 +11,9 @@ struct SavedServer: Codable, Identifiable {
     var port: UInt16
     var authMode: AuthMode
     var savedUsername: String?
+    /// Free-form display name used when connecting as a guest. Distinct from the account
+    /// `savedUsername`. Empty/nil falls back to the system full name.
+    var nickname: String?
     var keychainTag: String?
 
     var displayString: String {

clients/apple/macOS/VoiceCatMac/Sheets/AddServerSheet.swift

@@ -13,6 +13,7 @@ final class AddServerSheet: NSViewController {
         return f
     }()
     private let authPicker = NSPopUpButton()
+    private let nicknameField = NSTextField()
     private let usernameField = NSTextField()
     private let passwordField = NSSecureTextField()
     private let savePwCheckbox = NSButton(checkboxWithTitle: "Save password in Keychain", target: nil, action: nil)
@@ -35,6 +36,7 @@ final class AddServerSheet: NSViewController {
             hostField.stringValue = s.host
             portField.stringValue = "\(s.port)"
             authPicker.selectItem(withTitle: s.authMode == .guest ? "Guest" : "Account")
+            nicknameField.stringValue = s.nickname ?? ""
             usernameField.stringValue = s.savedUsername ?? ""
             updateAuthVisibility()
         }
@@ -47,6 +49,7 @@ final class AddServerSheet: NSViewController {
         let hostLabel = NSTextField(labelWithString: "Host:")
         let portLabel = NSTextField(labelWithString: "Port:")
         let authLabel = NSTextField(labelWithString: "Auth:")
+        let nickLabel = NSTextField(labelWithString: "Nickname:")
         let userLabel = NSTextField(labelWithString: "Username:")
         let pwLabel = NSTextField(labelWithString: "Password:")
 
@@ -60,6 +63,9 @@ final class AddServerSheet: NSViewController {
         authPicker.target = self; authPicker.action = #selector(authChanged)
         authPicker.setAccessibilityLabel("Authentication mode")
 
+        nicknameField.placeholderString = "leave blank to use your system name"
+        nicknameField.setAccessibilityLabel("Guest nickname (display name)")
+
         usernameField.placeholderString = "username"
         usernameField.setAccessibilityLabel("Username")
 
@@ -79,6 +85,7 @@ final class AddServerSheet: NSViewController {
             [hostLabel, hostField],
             [portLabel, portField],
             [authLabel, authPicker],
+            [nickLabel, nicknameField],
             [userLabel, usernameField],
             [pwLabel, passwordField],
             [NSView(), savePwCheckbox],
@@ -110,6 +117,7 @@ final class AddServerSheet: NSViewController {
 
     private func updateAuthVisibility() {
         let isAccount = authPicker.titleOfSelectedItem == "Account"
+        nicknameField.isEnabled = !isAccount
         usernameField.isEnabled = isAccount
         passwordField.isEnabled = isAccount
         savePwCheckbox.isEnabled = isAccount
@@ -130,6 +138,8 @@ final class AddServerSheet: NSViewController {
         server.host = host; server.port = port
         server.authMode = isGuest ? .guest : .password
         server.savedUsername = isGuest ? nil : usernameField.stringValue.trimmingCharacters(in: .whitespaces)
+        let nick = nicknameField.stringValue.trimmingCharacters(in: .whitespaces)
+        server.nickname = nick.isEmpty ? nil : nick
 
         if !isGuest && savePwCheckbox.state == .on {
             let pw = passwordField.stringValue

clients/apple/macOS/VoiceCatMac/Sheets/ChannelEditSheet.swift

@@ -25,7 +25,18 @@ final class ChannelEditSheet: NSViewController {
     }()
     private let fecCheckbox = NSButton(checkboxWithTitle: "FEC", target: nil, action: nil)
     private let dtxCheckbox = NSButton(checkboxWithTitle: "DTX", target: nil, action: nil)
+    private let dredCheckbox = NSButton(checkboxWithTitle: "DRED", target: nil, action: nil)
     private let frameMsPicker = NSPopUpButton()
+    private let applicationPicker = NSPopUpButton()
+    private let sampleRateField: NSTextField = {
+        let f = NSTextField(); f.stringValue = "48000"; return f
+    }()
+    private let packetLossField: NSTextField = {
+        let f = NSTextField(); f.stringValue = "5"; return f
+    }()
+    private let complexityField: NSTextField = {
+        let f = NSTextField(); f.stringValue = "10"; return f
+    }()
 
     init(channels: [Channel], editing: ChannelEdit?) {
         self.channels = channels
@@ -72,14 +83,24 @@ final class ChannelEditSheet: NSViewController {
         maxUsersField.setAccessibilityLabel("Max users (0 = unlimited)")
         sortOrderField.setAccessibilityLabel("Sort order")
 
-        for ms in ["20", "40", "60"] { frameMsPicker.addItem(withTitle: "\(ms) ms") }
+        for ms in ["10", "20", "40", "60"] { frameMsPicker.addItem(withTitle: "\(ms) ms") }
+        frameMsPicker.selectItem(withTitle: "20 ms")
         frameMsPicker.setAccessibilityLabel("Opus frame duration")
 
+        applicationPicker.addItem(withTitle: "VoIP")
+        applicationPicker.addItem(withTitle: "Audio")
+        applicationPicker.addItem(withTitle: "Low delay")
+        applicationPicker.setAccessibilityLabel("Opus application profile")
+
         fecCheckbox.state = .on
         stereoCheckbox.setAccessibilityLabel("Stereo audio")
         bitrateField.setAccessibilityLabel("Bitrate in bits per second")
+        sampleRateField.setAccessibilityLabel("Sample rate in Hz")
+        packetLossField.setAccessibilityLabel("Expected packet loss percent (0 to 100)")
+        complexityField.setAccessibilityLabel("Opus complexity (0 to 10)")
         fecCheckbox.setAccessibilityLabel("Forward error correction")
         dtxCheckbox.setAccessibilityLabel("Discontinuous transmission")
+        dredCheckbox.setAccessibilityLabel("Deep redundancy (DRED)")
 
         let generalGrid = NSGridView(views: [
             [NSTextField(labelWithString: "Name:"), nameField],
@@ -94,9 +115,13 @@ final class ChannelEditSheet: NSViewController {
 
         let audioGrid = NSGridView(views: [
             [NSTextField(labelWithString: "Bitrate:"), bitrateField],
+            [NSTextField(labelWithString: "Sample rate:"), sampleRateField],
             [NSTextField(labelWithString: "Frame:"), frameMsPicker],
+            [NSTextField(labelWithString: "Application:"), applicationPicker],
+            [NSTextField(labelWithString: "Packet loss %:"), packetLossField],
+            [NSTextField(labelWithString: "Complexity:"), complexityField],
             [stereoCheckbox, fecCheckbox],
-            [dtxCheckbox, NSView()],
+            [dtxCheckbox, dredCheckbox],
         ])
         audioGrid.rowSpacing = 8; audioGrid.columnSpacing = 8
         audioGrid.column(at: 0).xPlacement = .trailing
@@ -149,8 +174,13 @@ final class ChannelEditSheet: NSViewController {
         sortOrderField.stringValue = "\(e.sortOrder)"
         stereoCheckbox.state = e.audio.stereo ? .on : .off
         bitrateField.stringValue = "\(e.audio.bitrateBps)"
+        sampleRateField.stringValue = "\(e.audio.sampleRate)"
+        packetLossField.stringValue = "\(e.audio.expectedPacketLoss)"
+        complexityField.stringValue = "\(e.audio.complexity)"
         fecCheckbox.state = e.audio.fec ? .on : .off
         dtxCheckbox.state = e.audio.dtx ? .on : .off
+        dredCheckbox.state = e.audio.dred ? .on : .off
+        applicationPicker.selectItem(at: Int(min(e.audio.application, 2)))
         let frameStr = "\(e.audio.frameMs) ms"
         if let item = frameMsPicker.item(withTitle: frameStr) { frameMsPicker.select(item) }
     }
@@ -167,15 +197,24 @@ final class ChannelEditSheet: NSViewController {
         let maxUsers = UInt32(maxUsersField.stringValue) ?? 0
         let sortOrder = UInt32(sortOrderField.stringValue) ?? 0
         let bitrate = UInt32(bitrateField.stringValue) ?? 64000
+        let sampleRate = UInt32(sampleRateField.stringValue) ?? 48000
+        let packetLoss = min(UInt32(packetLossField.stringValue) ?? 5, 100)
+        let complexity = min(UInt32(complexityField.stringValue) ?? 10, 10)
         let frameMsStr = frameMsPicker.titleOfSelectedItem?.replacingOccurrences(of: " ms", with: "") ?? "20"
         let frameMs = UInt32(frameMsStr) ?? 20
+        let application = UInt32(max(applicationPicker.indexOfSelectedItem, 0))
 
         let audio = AudioConfig(
             stereo: stereoCheckbox.state == .on,
+            sampleRate: sampleRate,
             bitrateBps: bitrate,
             frameMs: frameMs,
+            application: application,
             fec: fecCheckbox.state == .on,
-            dtx: dtxCheckbox.state == .on
+            expectedPacketLoss: packetLoss,
+            dtx: dtxCheckbox.state == .on,
+            complexity: complexity,
+            dred: dredCheckbox.state == .on
         )
         let pwProtected = pwCheckbox.state == .on
         let pw: String? = pwProtected ? (pwField.stringValue.isEmpty ? nil : pwField.stringValue) : nil

clients/apple/macOS/VoiceCatMac/Windows/ConnectWindowController.swift

@@ -216,7 +216,7 @@ final class ConnectWindowController: NSWindowController, NSWindowDelegate {
 
         switch server.authMode {
         case .guest:
-            let nick = server.savedUsername?.isEmpty == false ? server.savedUsername! : NSFullUserName()
+            let nick = server.nickname?.isEmpty == false ? server.nickname! : NSFullUserName()
             newClient.authenticateGuest(nick)
         case .password:
             let username = server.savedUsername ?? ""
@@ -259,7 +259,7 @@ final class ConnectWindowController: NSWindowController, NSWindowDelegate {
         case .authResult:
             if event.result == .ok {
                 let nickname = server.authMode == .guest
-                    ? (server.savedUsername?.isEmpty == false ? server.savedUsername! : NSFullUserName())
+                    ? (server.nickname?.isEmpty == false ? server.nickname! : NSFullUserName())
                     : (server.savedUsername ?? "")
                 authSucceeded(client: client!, selfUserId: event.userId, nickname: nickname)
             } else {

clients/windows/VoiceCat.App/Forms/ChannelEditDialog.cs

@@ -28,6 +28,7 @@ public sealed class ChannelEditDialog : Form
     private CheckBox _chkFec = null!;
     private NumericUpDown _numExpectedLoss = null!;
     private CheckBox _chkDtx = null!;
+    private CheckBox _chkDred = null!;
     private NumericUpDown _numComplexity = null!;
 
     public ChannelEditInfo? Result { get; private set; }
@@ -183,7 +184,7 @@ public sealed class ChannelEditDialog : Form
 
     private void BuildAudioPage(TabPage page, AudioConfigInfo? audio)
     {
-        audio ??= new AudioConfigInfo(0, false, 48000, 0, 20, 0, true, 0, false, 10);
+        audio ??= new AudioConfigInfo(0, false, 48000, 0, 20, 0, true, 0, false, 10, false);
 
         int y = 16;
         int labelWidth = 150;
@@ -314,6 +315,17 @@ public sealed class ChannelEditDialog : Form
             TabIndex = 18,
         };
         page.Controls.Add(_chkDtx);
+        y += 28;
+
+        _chkDred = new CheckBox
+        {
+            Text = "D&RED (deep redundancy)",
+            Location = new Point(inputX, y),
+            AutoSize = true,
+            Checked = audio.Dred,
+            TabIndex = 19,
+        };
+        page.Controls.Add(_chkDred);
     }
 
     private static void AddLabel(Control parent, string text, int x, int y, int width)
@@ -362,7 +374,8 @@ public sealed class ChannelEditDialog : Form
             Fec: _chkFec.Checked,
             ExpectedPacketLoss: (uint)_numExpectedLoss.Value,
             Dtx: _chkDtx.Checked,
-            Complexity: (uint)_numComplexity.Value);
+            Complexity: (uint)_numComplexity.Value,
+            Dred: _chkDred.Checked);
 
         Result = new ChannelEditInfo(
             Id: _editingId,

clients/windows/VoiceCat.App/Forms/MainForm.cs

@@ -876,7 +876,7 @@ public partial class MainForm : Form
         var editInfo = new ChannelEditInfo(
             channel.Id, channel.ParentId, channel.Name, channel.Topic,
             channel.PasswordProtected, null, channel.MaxUsers, 0,
-            new AudioConfigInfo(0, false, 48000, 0, 20, 0, true, 0, false, 10));
+            new AudioConfigInfo(0, false, 48000, 0, 20, 0, true, 0, false, 10, false));
 
         using var dlg = new ChannelEditDialog(_channels, editInfo);
         if (dlg.ShowDialog(this) != DialogResult.OK || dlg.Result is null) return;

clients/windows/VoiceCat.Interop.Tests/VoiceCatClientSmokeTests.cs

@@ -188,7 +188,7 @@ public sealed class VoiceCatClientSmokeTests : IDisposable
             Password: null,
             MaxUsers: 42,
             SortOrder: 0,
-            Audio: new AudioConfigInfo(0, true, 48000, 64000, 20, 1, true, 5, false, 10))));
+            Audio: new AudioConfigInfo(0, true, 48000, 64000, 20, 1, true, 5, false, 10, false))));
         Assert.True(PumpUntil(client,
             () => events.Any(e => e.Type == VcEventType.GenericResult && e.Result == VcResult.Ok), 3000),
             "CreateChannel did not succeed");
@@ -208,7 +208,7 @@ public sealed class VoiceCatClientSmokeTests : IDisposable
             null,
             100,
             0,
-            new AudioConfigInfo(0, true, 48000, 64000, 20, 1, true, 5, false, 10))));
+            new AudioConfigInfo(0, true, 48000, 64000, 20, 1, true, 5, false, 10, false))));
         events.Clear();
         Assert.True(PumpUntil(client,
             () => events.Any(e => e.Type == VcEventType.GenericResult && e.Result == VcResult.Ok), 3000),

clients/windows/VoiceCat.Interop/Marshaling.cs

@@ -96,7 +96,8 @@ internal static class Marshaling
         native.Fec != 0,
         native.ExpectedPacketLoss,
         native.Dtx != 0,
-        native.Complexity);
+        native.Complexity,
+        native.Dred != 0);
 
     public static PermissionsInfo ToManaged(in VcPermissionsNative native) => new(
         native.CanCreateTempChannel != 0,

clients/windows/VoiceCat.Interop/Models.cs

@@ -71,4 +71,5 @@ public sealed record AudioConfigInfo(
     bool Fec,
     uint ExpectedPacketLoss,
     bool Dtx,
-    uint Complexity);
+    uint Complexity,
+    bool Dred);

clients/windows/VoiceCat.Interop/Structs.cs

@@ -61,6 +61,7 @@ internal struct VcAudioConfigNative
     public uint ExpectedPacketLoss;
     public int Dtx;
     public uint Complexity;
+    public int Dred;
 }
 
 [StructLayout(LayoutKind.Sequential)]

clients/windows/VoiceCat.Interop/VoiceCatClient.cs

@@ -346,6 +346,7 @@ public sealed class VoiceCatClient : IDisposable
                 ExpectedPacketLoss = info.Audio.ExpectedPacketLoss,
                 Dtx = info.Audio.Dtx ? 1 : 0,
                 Complexity = info.Audio.Complexity,
+                Dred = info.Audio.Dred ? 1 : 0,
             }
         };
     }