diff --git a/doc/manual/docs-template/how_to.md b/doc/manual/docs-template/how_to.md
index 993ce44f3..cadb10816 100644
--- a/doc/manual/docs-template/how_to.md
+++ b/doc/manual/docs-template/how_to.md
@@ -50,6 +50,8 @@ Embedded platform properties:
 -----------------------------------|------------------------------------
 HAVE_EMBEDDED_TIME_MS              | System provides time in milliseconds
 HAVE_EMBEDDED_TICK                 | System provides tick interrupt
+HAVE_HAL_AUDIO                     | Audio HAL is available
+HAVE_HAL_AUDIO_SINK_STEREO_ONLY    | Duplicate samples for mono playback 
 
 FreeRTOS platform properties:
 
diff --git a/platform/embedded/btstack_audio_embedded.c b/platform/embedded/btstack_audio_embedded.c
index 867a9b2d6..cbb0323b0 100644
--- a/platform/embedded/btstack_audio_embedded.c
+++ b/platform/embedded/btstack_audio_embedded.c
@@ -71,10 +71,16 @@ static          unsigned int output_buffer_samples;
 static volatile int       input_buffer_ready;
 static volatile const int16_t * input_buffer_samples;
 static volatile uint16_t  input_buffer_num_samples;
+static          unsigned int output_channels;
 
 static int source_active;
 static int sink_active;
 
+// Support for stereo-only audio hal
+#ifdef HAVE_HAL_AUDIO_SINK_STEREO_ONLY
+static bool output_duplicate_samples;
+#endif
+
 static void btstack_audio_audio_played(uint8_t buffer_index){
     output_buffer_to_play = (buffer_index + 1) % output_buffer_count;
 }
@@ -92,6 +98,18 @@ static void driver_timer_handler_sink(btstack_timer_source_t * ts){
         int16_t * buffer = hal_audio_sink_get_output_buffer(output_buffer_to_fill);
         (*playback_callback)(buffer, output_buffer_samples);
 
+#ifdef HAVE_HAL_AUDIO_SINK_STEREO_ONLY
+        if (output_duplicate_samples){
+            unsigned int i = output_buffer_samples;
+            do {
+                i--;
+                int16_t sample = buffer[i];
+                buffer[2*i + 0] = sample;
+                buffer[2*i + 1] = sample;
+            } while ( i > 0 );
+        }
+#endif
+
         // next
         output_buffer_to_fill = (output_buffer_to_fill + 1 ) % output_buffer_count;
     }
@@ -118,10 +136,14 @@ static int btstack_audio_embedded_sink_init(
     uint32_t samplerate, 
     void (*playback)(int16_t * buffer, uint16_t num_samples)
 ){
-    if (!playback){
-        log_error("No playback callback");
-        return 1;
-    }
+    btstack_assert(playback != NULL);
+    btstack_assert(channels != 0);
+
+#ifdef HAVE_HAL_AUDIO_SINK_STEREO_ONLY
+    // always use stereo from hal, duplicate samples if needed
+    output_duplicate_samples = num_channels != 2;
+    channels = 2;
+#endif
 
     playback_callback  = playback;
 
@@ -159,6 +181,8 @@ static void btstack_audio_embedded_sink_start_stream(void){
     output_buffer_count   = hal_audio_sink_get_num_output_buffers();
     output_buffer_samples = hal_audio_sink_get_num_output_buffer_samples();
 
+    btstack_assert(output_buffer_samples > 0);
+
     // pre-fill HAL buffers
     uint16_t i;
     for (i=0;i<output_buffer_count;i++){