diff --git a/client/public/version.js b/client/public/version.js
index 6e528a1..41f9ebe 100644
--- a/client/public/version.js
+++ b/client/public/version.js
@@ -1,5 +1,5 @@
 // Maintainer-controlled web client version.
 // Format: YYYY.MM.DD Rn (example: 2026.02.20 R2)
-window.CHGRID_WEB_VERSION = "2026.02.22 R163";
+window.CHGRID_WEB_VERSION = "2026.02.22 R164";
 // Optional display timezone for timestamps. Falls back to America/Detroit if unset/invalid.
 window.CHGRID_TIME_ZONE = "America/Detroit";
diff --git a/client/src/main.ts b/client/src/main.ts
index 072ed88..96e2968 100644
--- a/client/src/main.ts
+++ b/client/src/main.ts
@@ -573,7 +573,13 @@ function navigateChatBuffer(target: 'prev' | 'next' | 'first' | 'last'): void {
   }
 
   updateStatus(messageBuffer[messageCursor]);
-  audio.sfxUiBlip();
+  if (target === 'prev' || target === 'next') {
+    const atStart = messageCursor === 0;
+    const atEnd = messageCursor === messageBuffer.length - 1;
+    if (atStart || atEnd) {
+      audio.sfxUiBlip();
+    }
+  }
 }
 
 /** Updates compact input/output device summary labels in the pre-connect UI. */
@@ -1288,7 +1294,7 @@ function handleNormalModeInput(code: string, shiftKey: boolean): void {
       const next = audio.adjustMasterVolume(step);
       persistMasterVolume(next);
       updateStatus(`Master volume ${next}`);
-      audio.sfxUiBlip();
+      audio.sfxEffectLevel(next === 50);
       return;
     }
     case 'openEffectSelect': {