diff --git a/firmware/export/pcm_record.h b/firmware/export/pcm_record.h
index 964d3a003e..af73108d86 100644
--- a/firmware/export/pcm_record.h
+++ b/firmware/export/pcm_record.h
@@ -48,4 +48,6 @@ unsigned long pcm_num_recorded_bytes(void);
 void pcm_pause_recording(void);
 void pcm_resume_recording(void);
 
+void pcmrec_set_mux(int source);
+
 #endif
diff --git a/firmware/pcm_record.c b/firmware/pcm_record.c
index 3101a16e02..6eb7bbcba8 100644
--- a/firmware/pcm_record.c
+++ b/firmware/pcm_record.c
@@ -655,4 +655,13 @@ static void pcmrec_thread(void)
     logf("thread pcmrec done");
 }
 
-
+void pcmrec_set_mux(int source)
+{
+    if(source == 0)
+        and_l(~0x00800000, &GPIO_OUT);  /* Line In */
+    else
+        or_l(0x00800000, &GPIO_OUT);    /* FM radio */
+        
+    or_l(0x00800000, &GPIO_ENABLE);
+    or_l(0x00800000, &GPIO_FUNCTION);
+}