diff --git a/routes/listening_post.py b/routes/listening_post.py
index 028aa13..c2282f8 100644
--- a/routes/listening_post.py
+++ b/routes/listening_post.py
@@ -1606,14 +1606,25 @@ def audio_probe() -> Response:
     return jsonify({'status': 'ok', 'bytes': size})
 
 
-@receiver_bp.route('/audio/stream')
-def stream_audio() -> Response:
-    """Stream WAV audio."""
-    if audio_source == 'waterfall':
-        for _ in range(40):
-            if audio_running:
-                break
-            time.sleep(0.05)
+@receiver_bp.route('/audio/stream')
+def stream_audio() -> Response:
+    """Stream WAV audio."""
+    request_token_raw = request.args.get('request_token')
+    request_token = None
+    if request_token_raw is not None:
+        try:
+            request_token = int(request_token_raw)
+        except (ValueError, TypeError):
+            request_token = None
+
+    if request_token is not None and request_token < audio_start_token:
+        return Response(b'', mimetype='audio/wav', status=204)
+
+    if audio_source == 'waterfall':
+        for _ in range(40):
+            if audio_running:
+                break
+            time.sleep(0.05)
 
         if not audio_running:
             return Response(b'', mimetype='audio/wav', status=204)
@@ -1633,6 +1644,8 @@ def stream_audio() -> Response:
             inactive_since: float | None = None
 
             while audio_running and audio_source == 'waterfall':
+                if request_token is not None and request_token < audio_start_token:
+                    break
                 chunk = read_shared_monitor_audio_chunk(timeout=1.0)
                 if chunk:
                     inactive_since = None
@@ -1672,11 +1685,11 @@ def stream_audio() -> Response:
     if not audio_running or not audio_process:
         return Response(b'', mimetype='audio/wav', status=204)
 
-    def generate():
-        # Capture local reference to avoid race condition with stop
-        proc = audio_process
-        if not proc or not proc.stdout:
-            return
+    def generate():
+        # Capture local reference to avoid race condition with stop
+        proc = audio_process
+        if not proc or not proc.stdout:
+            return
         try:
             # Drain stale audio that accumulated in the pipe buffer
             # between pipeline start and stream connection.  Keep the
@@ -1695,15 +1708,17 @@ def stream_audio() -> Response:
             if header_chunk:
                 yield header_chunk
 
-            # Stream real-time audio
-            first_chunk_deadline = time.time() + 20.0
-            warned_wait = False
-            while audio_running and proc.poll() is None:
-                # Use select to avoid blocking forever
-                ready, _, _ = select.select([proc.stdout], [], [], 2.0)
-                if ready:
-                    chunk = proc.stdout.read(8192)
-                    if chunk:
+            # Stream real-time audio
+            first_chunk_deadline = time.time() + 20.0
+            warned_wait = False
+            while audio_running and proc.poll() is None:
+                if request_token is not None and request_token < audio_start_token:
+                    break
+                # Use select to avoid blocking forever
+                ready, _, _ = select.select([proc.stdout], [], [], 2.0)
+                if ready:
+                    chunk = proc.stdout.read(8192)
+                    if chunk:
                         warned_wait = False
                         yield chunk
                     else:
diff --git a/static/js/modes/waterfall.js b/static/js/modes/waterfall.js
index f428d6e..e202ccf 100644
--- a/static/js/modes/waterfall.js
+++ b/static/js/modes/waterfall.js
@@ -2603,7 +2603,7 @@ const Waterfall = (function () {
         player.load();
     }
 
-    async function _attachMonitorAudio(nonce) {
+    async function _attachMonitorAudio(nonce, streamToken = null) {
         const player = document.getElementById('wfAudioPlayer');
         if (!player) {
             return { ok: false, reason: 'player_missing', message: 'Audio player is unavailable.' };
@@ -2622,7 +2622,10 @@ const Waterfall = (function () {
             }
 
             await _pauseMonitorAudioElement();
-            player.src = `/receiver/audio/stream?fresh=1&t=${Date.now()}-${attempt}`;
+            const tokenQuery = (streamToken !== null && streamToken !== undefined && String(streamToken).length > 0)
+                ? `&request_token=${encodeURIComponent(String(streamToken))}`
+                : '';
+            player.src = `/receiver/audio/stream?fresh=1&t=${Date.now()}-${attempt}${tokenQuery}`;
             player.load();
 
             try {
@@ -2886,7 +2889,7 @@ const Waterfall = (function () {
                 return;
             }
 
-            const attach = await _attachMonitorAudio(nonce);
+            const attach = await _attachMonitorAudio(nonce, payload?.request_token);
             if (nonce !== _audioConnectNonce) return;
             _monitorSource = payload?.source === 'waterfall' ? 'waterfall' : 'process';
             if (