diff --git a/crates/wzp-native/cpp/oboe_bridge.cpp b/crates/wzp-native/cpp/oboe_bridge.cpp
index 29b9e90..82ba79c 100644
--- a/crates/wzp-native/cpp/oboe_bridge.cpp
+++ b/crates/wzp-native/cpp/oboe_bridge.cpp
@@ -254,18 +254,28 @@ int wzp_oboe_start(const WzpOboeConfig* config, const WzpOboeRings* rings) {
     oboe::AudioStreamBuilder captureBuilder;
     captureBuilder.setDirection(oboe::Direction::Input)
         ->setPerformanceMode(oboe::PerformanceMode::LowLatency)
-        // Shared mode allows Oboe's internal resampler to bridge 48kHz to
-        // the hardware rate (8/16kHz for BT SCO). Exclusive mode bypasses
-        // the resampler and fails with "getInputProfile could not find profile".
         ->setSharingMode(oboe::SharingMode::Shared)
         ->setFormat(oboe::AudioFormat::I16)
         ->setChannelCount(config->channel_count)
-        ->setSampleRate(config->sample_rate)
-        ->setFramesPerDataCallback(config->frames_per_burst)
-        ->setInputPreset(oboe::InputPreset::VoiceCommunication)
         ->setSampleRateConversionQuality(oboe::SampleRateConversionQuality::Best)
         ->setDataCallback(&g_capture_cb);
 
+    if (config->bt_active) {
+        // BT SCO mode: do NOT set sample rate or input preset.
+        // Requesting 48kHz against a BT SCO device fails with
+        // "getInputProfile could not find profile". Letting the system
+        // choose the native rate (8/16kHz) and relying on Oboe's
+        // resampler (SampleRateConversionQuality::Best) to bridge
+        // to our 48kHz ring buffer is the only path that works.
+        // InputPreset::VoiceCommunication can also prevent BT SCO
+        // routing on some devices — skip it for BT.
+        LOGI("capture: BT mode — no sample rate or input preset set");
+    } else {
+        captureBuilder.setSampleRate(config->sample_rate)
+            ->setFramesPerDataCallback(config->frames_per_burst)
+            ->setInputPreset(oboe::InputPreset::VoiceCommunication);
+    }
+
     oboe::Result result = captureBuilder.openStream(g_capture_stream);
     if (result != oboe::Result::OK) {
         LOGE("Failed to open capture stream: %s", oboe::convertToText(result));
@@ -321,12 +331,20 @@ int wzp_oboe_start(const WzpOboeConfig* config, const WzpOboeRings* rings) {
         ->setSharingMode(oboe::SharingMode::Shared)
         ->setFormat(oboe::AudioFormat::I16)
         ->setChannelCount(config->channel_count)
-        ->setSampleRate(config->sample_rate)
-        ->setFramesPerDataCallback(config->frames_per_burst)
-        ->setUsage(oboe::Usage::VoiceCommunication)
         ->setSampleRateConversionQuality(oboe::SampleRateConversionQuality::Best)
         ->setDataCallback(&g_playout_cb);
 
+    if (config->bt_active) {
+        LOGI("playout: BT mode — no sample rate set, using Usage::Media");
+        // Usage::Media instead of VoiceCommunication for BT output
+        // to avoid conflicts with the communication device routing.
+        playoutBuilder.setUsage(oboe::Usage::Media);
+    } else {
+        playoutBuilder.setSampleRate(config->sample_rate)
+            ->setFramesPerDataCallback(config->frames_per_burst)
+            ->setUsage(oboe::Usage::VoiceCommunication);
+    }
+
     result = playoutBuilder.openStream(g_playout_stream);
     if (result != oboe::Result::OK) {
         LOGE("Failed to open playout stream: %s", oboe::convertToText(result));
diff --git a/crates/wzp-native/cpp/oboe_bridge.h b/crates/wzp-native/cpp/oboe_bridge.h
index 8c2f143..bc342ab 100644
--- a/crates/wzp-native/cpp/oboe_bridge.h
+++ b/crates/wzp-native/cpp/oboe_bridge.h
@@ -16,6 +16,7 @@ typedef struct {
     int32_t sample_rate;
     int32_t frames_per_burst;
     int32_t channel_count;
+    int32_t bt_active;  /* nonzero = BT SCO mode: skip sample rate + input preset */
 } WzpOboeConfig;
 
 typedef struct {
diff --git a/crates/wzp-native/src/lib.rs b/crates/wzp-native/src/lib.rs
index d358941..cec4361 100644
--- a/crates/wzp-native/src/lib.rs
+++ b/crates/wzp-native/src/lib.rs
@@ -47,6 +47,10 @@ struct WzpOboeConfig {
     sample_rate: i32,
     frames_per_burst: i32,
     channel_count: i32,
+    /// When nonzero, capture stream skips setSampleRate and setInputPreset
+    /// so the system can route to BT SCO at its native rate (8/16kHz).
+    /// Oboe's SampleRateConversionQuality::Best resamples to 48kHz.
+    bt_active: i32,
 }
 
 #[repr(C)]
@@ -204,6 +208,17 @@ fn backend() -> &'static AudioBackend {
 /// Idempotent — calling while already running is a no-op that returns 0.
 #[unsafe(no_mangle)]
 pub extern "C" fn wzp_native_audio_start() -> i32 {
+    audio_start_inner(false)
+}
+
+/// Start Oboe in Bluetooth SCO mode — skips sample rate and input preset
+/// on capture so the system can route to the BT SCO device natively.
+#[unsafe(no_mangle)]
+pub extern "C" fn wzp_native_audio_start_bt() -> i32 {
+    audio_start_inner(true)
+}
+
+fn audio_start_inner(bt: bool) -> i32 {
     let b = backend();
     let mut started = match b.started.lock() {
         Ok(g) => g,
@@ -217,6 +232,7 @@ pub extern "C" fn wzp_native_audio_start() -> i32 {
         sample_rate: 48_000,
         frames_per_burst: FRAME_SAMPLES as i32,
         channel_count: 1,
+        bt_active: if bt { 1 } else { 0 },
     };
     let rings = WzpOboeRings {
         capture_buf: b.capture.buf_ptr(),
diff --git a/desktop/src-tauri/src/lib.rs b/desktop/src-tauri/src/lib.rs
index 0a2c685..e6965e3 100644
--- a/desktop/src-tauri/src/lib.rs
+++ b/desktop/src-tauri/src/lib.rs
@@ -814,10 +814,18 @@ async fn set_bluetooth_sco(on: bool) -> Result<(), String> {
         }
         if wzp_native::is_loaded() && wzp_native::audio_is_running() {
             tracing::info!(on, "set_bluetooth_sco: restarting Oboe for route change");
-            tokio::task::spawn_blocking(|| {
+            tokio::task::spawn_blocking(move || {
                 wzp_native::audio_stop();
-                wzp_native::audio_start()
-                    .map_err(|code| format!("audio_start after BT toggle: code {code}"))
+                if on {
+                    // BT mode: skip sample rate + input preset on capture
+                    // so the system can route to the BT SCO device natively.
+                    wzp_native::audio_start_bt()
+                        .map_err(|code| format!("audio_start_bt after BT on: code {code}"))
+                } else {
+                    // Normal mode: restore 48kHz + VoiceCommunication preset.
+                    wzp_native::audio_start()
+                        .map_err(|code| format!("audio_start after BT off: code {code}"))
+                }
             })
             .await
             .map_err(|e| format!("spawn_blocking join: {e}"))??;
diff --git a/desktop/src-tauri/src/wzp_native.rs b/desktop/src-tauri/src/wzp_native.rs
index 4f73e98..e96e39e 100644
--- a/desktop/src-tauri/src/wzp_native.rs
+++ b/desktop/src-tauri/src/wzp_native.rs
@@ -26,6 +26,7 @@ static LIB: OnceLock<libloading::Library> = OnceLock::new();
 static VERSION: OnceLock<unsafe extern "C" fn() -> i32> = OnceLock::new();
 static HELLO: OnceLock<unsafe extern "C" fn(*mut u8, usize) -> usize> = OnceLock::new();
 static AUDIO_START: OnceLock<unsafe extern "C" fn() -> i32> = OnceLock::new();
+static AUDIO_START_BT: OnceLock<unsafe extern "C" fn() -> i32> = OnceLock::new();
 static AUDIO_STOP: OnceLock<unsafe extern "C" fn()> = OnceLock::new();
 static AUDIO_READ_CAPTURE: OnceLock<unsafe extern "C" fn(*mut i16, usize) -> usize> = OnceLock::new();
 static AUDIO_WRITE_PLAYOUT: OnceLock<unsafe extern "C" fn(*const i16, usize) -> usize> = OnceLock::new();
@@ -65,6 +66,7 @@ pub fn init() -> Result<(), String> {
         resolve!(VERSION, unsafe extern "C" fn() -> i32, b"wzp_native_version");
         resolve!(HELLO, unsafe extern "C" fn(*mut u8, usize) -> usize, b"wzp_native_hello");
         resolve!(AUDIO_START, unsafe extern "C" fn() -> i32, b"wzp_native_audio_start");
+        resolve!(AUDIO_START_BT, unsafe extern "C" fn() -> i32, b"wzp_native_audio_start_bt");
         resolve!(AUDIO_STOP, unsafe extern "C" fn(), b"wzp_native_audio_stop");
         resolve!(AUDIO_READ_CAPTURE, unsafe extern "C" fn(*mut i16, usize) -> usize, b"wzp_native_audio_read_capture");
         resolve!(AUDIO_WRITE_PLAYOUT, unsafe extern "C" fn(*const i16, usize) -> usize, b"wzp_native_audio_write_playout");
@@ -104,6 +106,14 @@ pub fn audio_start() -> Result<(), i32> {
     if ret == 0 { Ok(()) } else { Err(ret) }
 }
 
+/// Start Oboe in Bluetooth SCO mode — capture skips sample rate and
+/// input preset so the system routes to the BT SCO device natively.
+pub fn audio_start_bt() -> Result<(), i32> {
+    let f = AUDIO_START_BT.get().ok_or(-100_i32)?;
+    let ret = unsafe { f() };
+    if ret == 0 { Ok(()) } else { Err(ret) }
+}
+
 /// Stop both streams. Safe to call even if not running.
 pub fn audio_stop() {
     if let Some(f) = AUDIO_STOP.get() {