diff --git a/apps/chanora_flutter/pubspec.yaml b/apps/chanora_flutter/pubspec.yaml
index 2c30fbc..9b6ccac 100644
--- a/apps/chanora_flutter/pubspec.yaml
+++ b/apps/chanora_flutter/pubspec.yaml
@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.0.0-rc.8+60
+version: 1.0.0-rc.8+61
 
 environment:
   sdk: ^3.11.5
diff --git a/crates/chanora_audio/src/engine.rs b/crates/chanora_audio/src/engine.rs
index ed6e7ca..dbb762d 100644
--- a/crates/chanora_audio/src/engine.rs
+++ b/crates/chanora_audio/src/engine.rs
@@ -13,9 +13,14 @@ use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
 #[cfg(not(target_os = "ios"))]
 use cpal::{SampleFormat, SizedSample};
 use tokio::sync::mpsc;
-use tracing::{debug, error, info, warn};
-
+use tracing::{debug, info};
+// `error!` and `warn!` are used only inside the cpal capture /
+// playback paths (`build_input_stream`, `build_output_stream`,
+// `try_open_capture` log lines). Cfg-gate the imports too so iOS
+// builds don't carry an unused-imports warning.
 #[cfg(not(target_os = "ios"))]
+use tracing::{error, warn};
+
 #[cfg(not(target_os = "ios"))]
 use audiopus::coder::Encoder as OpusEncoder;
 #[cfg(not(target_os = "ios"))]
@@ -26,9 +31,16 @@ use audiopus::{
 
 use tsclientlib::audio::AudioHandler;
 
-use chanora_protocol::{
-    AudioData, CodecType, InboundVoice, OutAudio, OutPacket,
-};
+// `AudioData`, `CodecType`, `OutAudio` are referenced only by the
+// cpal capture pipeline's Opus encode path (`CaptureState::encode_and_send`).
+// `InboundVoice` + `OutPacket` are used by every platform — the
+// inbound forwarder task pumps `InboundVoice` into AudioHandler on
+// iOS too, and `OutPacket` flows out of the capture pipeline once
+// commit 3 lands. Cfg-gate the cpal-only ones to keep iOS warnings
+// clean.
+#[cfg(not(target_os = "ios"))]
+use chanora_protocol::{AudioData, CodecType, OutAudio};
+use chanora_protocol::{InboundVoice, OutPacket};
 
 use crate::AudioError;
 
@@ -641,12 +653,24 @@ impl AudioEngine {
         // The platform PTT backend is no longer owned by the
         // engine (SDD-088); its lifecycle is managed by
         // `chanora_core::ptt::PttController`. The engine only
-        // needs to abort its watchdog and drop the cpal streams.
+        // needs to abort its watchdog and drop the audio streams.
         // Aborting the watchdog cancels its tokio task.
         self.ptt_watchdog.take();
         // Drop the streams, which stops their callback threads.
-        let _ = self._input_stream.lock().unwrap().take();
-        let _ = self._output_stream.lock().unwrap().take();
+        // Each platform has a slightly different backend; the
+        // common contract is that dropping the wrapper stops
+        // audio. iOS collapses input + output into one
+        // `IosVoiceUnit` (see `ios_voice_unit.rs`); every other
+        // platform has separate cpal input + cpal/SDL output.
+        #[cfg(not(target_os = "ios"))]
+        {
+            let _ = self._input_stream.lock().unwrap().take();
+            let _ = self._output_stream.lock().unwrap().take();
+        }
+        #[cfg(target_os = "ios")]
+        {
+            let _ = self._ios_voice_unit.lock().unwrap().take();
+        }
         info!(target: "chanora_audio", "audio engine stopped");
     }
 
diff --git a/crates/chanora_audio/src/ios_voice_unit.rs b/crates/chanora_audio/src/ios_voice_unit.rs
index 0a7a867..d5bbf3d 100644
--- a/crates/chanora_audio/src/ios_voice_unit.rs
+++ b/crates/chanora_audio/src/ios_voice_unit.rs
@@ -75,14 +75,12 @@
 //! * AVAudioSession category / mode configuration — Swift owns the
 //!   session (it must be set up before Flutter loads).
 
-use std::sync::atomic::{AtomicBool, AtomicU32, Ordering};
+use std::sync::atomic::{AtomicBool, AtomicU32};
 use std::sync::{Arc, Mutex};
 
+use coreaudio::audio_unit::audio_format::LinearPcmFlags;
 use coreaudio::audio_unit::render_callback::{self, data};
-use coreaudio::audio_unit::{
-    AudioUnit, Element, SampleFormat, Scope, StreamFormat,
-};
-use coreaudio::audio_unit::stream_format::LinearPcmFlags;
+use coreaudio::audio_unit::{AudioUnit, Element, SampleFormat, Scope, StreamFormat};
 use coreaudio::audio_unit::IOType;
 use tokio::sync::mpsc;
 use tracing::{info, warn};
@@ -90,7 +88,7 @@ use tsclientlib::audio::AudioHandler;
 
 use crate::engine::SessionAudioId;
 use crate::AudioError;
-use chanora_protocol::voice::OutPacket;
+use chanora_protocol::OutPacket;
 
 /// 20 ms at 48 kHz mono — one Opus frame's worth of samples.
 /// Aligning the AudioUnit IO buffer to this frame size keeps the