diff --git a/src/tuimble/app.py b/src/tuimble/app.py
index eef5e78..92b591e 100644
--- a/src/tuimble/app.py
+++ b/src/tuimble/app.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import html
 import logging
+import time
 
 from textual import events, on, work
 from textual.app import App, ComposeResult
@@ -12,6 +13,7 @@ from textual.message import Message
 from textual.reactive import reactive
 from textual.widgets import Footer, Header, Input, RichLog, Static
 
+from tuimble.audio import AudioPipeline
 from tuimble.client import Channel, MumbleClient
 from tuimble.config import Config, load_config
 from tuimble.ptt import KittyPtt, TogglePtt, detect_backend
@@ -210,6 +212,13 @@ class TuimbleApp(App):
             username=srv.username,
             password=srv.password,
         )
+        acfg = self._config.audio
+        self._audio = AudioPipeline(
+            sample_rate=acfg.sample_rate,
+            frame_size=acfg.frame_size,
+            input_device=acfg.input_device,
+            output_device=acfg.output_device,
+        )
 
     def compose(self) -> ComposeResult:
         yield Header()
@@ -238,6 +247,7 @@ class TuimbleApp(App):
         self._client.on_text_message = self._cb_text_message
         self._client.on_user_update = self._cb_state_changed
         self._client.on_channel_update = self._cb_state_changed
+        self._client.on_sound_received = self._cb_sound_received
 
         try:
             self._client.connect()
@@ -256,6 +266,9 @@ class TuimbleApp(App):
     def _cb_state_changed(self) -> None:
         self.post_message(ServerStateChanged())
 
+    def _cb_sound_received(self, _user, pcm_data: bytes) -> None:
+        self._audio.queue_playback(pcm_data)
+
     def _show_error(self, text: str) -> None:
         chatlog = self.query_one("#chatlog", ChatLog)
         chatlog.write(f"[#f7768e]\u2717 {text}[/]")
@@ -273,6 +286,7 @@ class TuimbleApp(App):
             f"[#9ece6a]\u2713 connected as {self._config.server.username}[/]"
         )
         self._refresh_channel_tree()
+        self._start_audio()
 
     def on_server_disconnected(self, _msg: ServerDisconnected) -> None:
         status = self.query_one("#status", StatusBar)
@@ -311,6 +325,29 @@ class TuimbleApp(App):
             f"[#e0af68]{self._config.server.username}[/] {text}"
         )
 
+    # -- audio ---------------------------------------------------------------
+
+    def _start_audio(self) -> None:
+        """Start audio pipeline; log error if hardware unavailable."""
+        chatlog = self.query_one("#chatlog", ChatLog)
+        try:
+            self._audio.start()
+            chatlog.write("[dim]audio pipeline started[/dim]")
+            self._audio_send_loop()
+        except Exception as exc:
+            chatlog.write(f"[#f7768e]\u2717 audio: {exc}[/]")
+            log.warning("audio start failed: %s", exc)
+
+    @work(thread=True)
+    def _audio_send_loop(self) -> None:
+        """Poll capture queue and send encoded frames to server."""
+        while self._client.connected:
+            frame = self._audio.get_encoded_frame()
+            if frame is not None:
+                self._client.send_audio(frame)
+            else:
+                time.sleep(0.005)
+
     # -- channel tree --------------------------------------------------------
 
     def _refresh_channel_tree(self) -> None:
@@ -344,12 +381,14 @@ class TuimbleApp(App):
                 self._ptt.toggle()
 
     def _on_ptt_change(self, transmitting: bool) -> None:
+        self._audio.capturing = transmitting
         status = self.query_one("#status", StatusBar)
         status.ptt_active = transmitting
 
     # -- lifecycle -----------------------------------------------------------
 
     def action_quit(self) -> None:
+        self._audio.stop()
         self._client.set_dispatcher(None)
         self._client.disconnect()
         self.exit()