EdnunpandClaude Opus 4.7
af0e7c3fff
* New "Opus, live latency" codec mode: 2.5 ms frames (120 samples/ch at 48 kHz)
via the float-input encode path. End-to-end codec delay drops to ~5 ms (vs
~12.5 ms at standard 10 ms Opus). Test on LAN: 400 pps/lane, zero missed /
reordered / duplicate packets, ~15 ms one-way saved end-to-end.
* Wire-format change: AudioFormatInfo.FrameDurationMilliseconds renamed to
FrameSamplesPerChannel (int sample-count at announced sample rate). Removes
the lossy 48000*ms/1000 conversion that couldn't represent 2.5 ms. v3 <-> v3
exact; v3 <-> v2 still passes audio (Opus decoder is self-describing from
packet TOC) but v2 side over-sizes its buffer wildly. v2.x profiles auto-
migrate via <120 sentinel rule in RemSoundSettingsStore (anything below 120
is treated as legacy ms and multiplied by 48). Profile JSON key kept as
OpusFrameMilliseconds via [JsonPropertyName] so old profile files still load.
* Codec dropdown rebuilt with use-case names: "PCM 48K 24 bit - uncompressed",
"Opus, broadcast quality - loss tolerant", "Opus, live latency - for jamming
and monitoring". Middle 10 ms option retired; saved 480-sample profiles
collapse to broadcast quality (safer-side default).
* Profile auto-resume after self-update: RemSoundUpdater writes a one-shot
_resume-after-update.txt sentinel containing the active profile title before
exit; Program.Main reads + deletes it on next start and silently loads that
profile, skipping the picker. Helper batch's robocopy /XF excludes the
sentinel and the failure-branch cleans it up if the install aborts. Falls
through to normal startup behaviour (StartWithProfileTitle or picker) if the
sentinel is missing, empty, or names a profile that no longer exists.
* Read-only profile saves now go through on explicit Ctrl+S / File -> Save
with a one-time TaskDialog warning ("Save anyway" / "Cancel" + Do-not-show-
again). Lock continues to suppress the automatic unsaved-changes prompt on
close / profile switch (its main job). AppConfig.SaveOnReadOnlyMessageSuppressed
renamed to SaveOnReadOnlyWarningSuppressed; v2.x suppression flag is silently
discarded since the behaviour changed and the user needs to see the warning
once on each machine.
* Manual (readme.html) updated: codec table rewritten with the three new
choices and corrected bandwidth figures, send-rate description updated, new
sections "The same profile picks up automatically after an update" and
"Saving on purpose while a profile is locked".
* Subsumes the never-separately-released v2.2 work: native Opus encoder
(~97% less per-second memory churn on Opus send path via Concentus.Native),
efficiency tidy-ups (item 4 ASIO probe rate, item 6 WaitHandle, item 7
snapshot cache, items 14/16 heartbeat + discovery), legacy cleanup
(items 30/34/35/36: KeepAlive infrastructure, drift drop/repeat/accumulator
fields, fan-out cache stat). New diagnostic columns cpu/memMB/wsMB/
allocKBps/captureMs/sendMs/recvMs/renderMs gated on Enable-logs.
About dialog updated with v3.0 block at top; v2.2 block retained for the
subsumed work.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
RemSound
Low-latency peer-to-peer audio between two or more Windows PCs over UDP. Pick what each machine captures and what it plays back; audio flows directly between them, no central server.
Built for music collaboration over the internet, live monitoring across rooms in a house, podcast co-hosting, NVDA-Remote audio workflows, and anything else that wants "send the sound from this PC to that PC, fast".
Highlights
- WASAPI and ASIO side by side. Run them as two independent UDP streams at their own native latencies, or use WASAPI alone. ASIO drivers get hardware-clocked timing; WASAPI gets push-mode timing on single-source captures.
- Profiles. Save your full setup (device ticks, peers, codec, latency targets, hotkeys, ASIO driver) into one JSON file. Pick which profile to load at launch.
- Continuous auto-tune. Watches receive jitter and nudges the latency target to stay click-free without forcing you to overshoot. Independent per-lane in WASAPI+ASIO mode.
- Opus with inband FEC. Single-packet losses recover transparently — no click. PCM 24-bit 48 kHz is also available for clean LAN.
- Remote control hotkeys. Configurable global hotkeys can nudge a peer's RemSound volume or their Windows system master volume, opt-in on the receiver.
- Built-in self-updater. Optional GitHub-driven update check on a schedule you set.
- Designed for screen readers. Each control has a paired Alt+letter mnemonic. State changes raise the right UIA notifications. F1 anywhere opens the user manual.
Install
- Download the latest
RemSound-vX.Y.zipfrom Releases. - Extract somewhere it can write — e.g.
C:\RemSound\, yourDocuments, or a folder in your user profile. AvoidProgram Filesunless you grant write permission to the install folder (the self-updater needs to overwrite files in place). - Run
RemSound.exe. On first launch Windows Firewall will prompt — allow on private networks. - Open the user manual from the Help menu (or press F1) for the full walkthrough.
RemSound requires the .NET 10 Desktop Runtime. If it's not installed, Windows offers to fetch it on first launch. You can also install it from https://dotnet.microsoft.com/download/dotnet/10.0 (pick the "Windows x64 Desktop Runtime").
Updates
RemSound can check this repository's Releases page on a schedule (never, hourly, every 6 hours, every 24 hours) and either prompt you to install or do it silently. Configure via File → Preferences. You can also trigger a manual check from the Help menu or the same Preferences dialog.
Build from source
You need the .NET 10 SDK. The solution lives at RemSound.slnx.
cd D:\proj\RemSound
dotnet build -c Release
dotnet publish src\RemSound.App\RemSound.App.csproj -c Release
The publish output lands at src\RemSound.App\bin\Release\net10.0-windows\publish\. Copy its contents into a folder of your choice — or zip it for distribution. Don't enable PublishSingleFile or SelfContained=true; RemSound ships framework-dependent on purpose so the publish folder stays under 2 MB.
Project layout
src/RemSound.Core packet protocol, peer discovery, hotkeys, MMCSS, heartbeat, settings, AppConfig
src/RemSound.Sender capture → mix → encode → UDP send
src/RemSound.Receiver UDP receive → ring buffer → drift-corrected playout → render
src/RemSound.Harness console test program (1 sender → 1 receiver, no UI)
src/RemSound.App WinForms UI (sender + receiver + heartbeat + discovery + updater)
server/ optional Raspberry Pi / systemd-Linux relay bundle (see below)
Optional: running your own relay server
Two RemSound peers normally reach each other directly over your LAN, or via Tailscale across the internet. If neither of those work for your situation — for example one peer is behind a router that won't forward inbound UDP and you'd prefer not to use Tailscale — you can run a small Python relay on a publicly-reachable host (a Raspberry Pi at home with one UDP port forwarded works fine) and have both peers dial that.
The server/ folder in this repo is a self-contained bundle: relay script, systemd unit, install / uninstall / smoke-test scripts, and a step-by-step README. See server/README.md for the setup walkthrough.
Issues and feedback
Open an issue on the GitHub issues page. If reporting an audio problem, please tick File → Preferences → Enable logs, reproduce the issue, then attach the latest log file from logs\ next to RemSound.exe.
Licence
MIT. See LICENSE.