fix(audio): clipped SPI audio on nv14/el18/x12s (#5905)

radio/src/audio.h

@@ -90,10 +90,10 @@ constexpr uint8_t AUDIO_FILENAME_MAXLEN = (AUDIO_LUA_FILENAME_MAXLEN > AUDIO_MOD
 
 #if defined(SIMU) && defined(SIMU_AUDIO)
   #define AUDIO_BUFFER_COUNT           (10) // simulator needs more buffers for smooth audio
-#elif defined(PCBX12S)
+#elif defined(AUDIO_SPI)
   #define AUDIO_BUFFER_COUNT           (2)  // smaller than Taranis since there is also a buffer on the ADC chip
-#elif defined(PCBPL18)
-  #define AUDIO_BUFFER_COUNT           (10) // PL18 need more buffer for smooth audio
+#elif defined(STORAGE_USE_SPI_FLASH)
+  #define AUDIO_BUFFER_COUNT           (10) // SPI Flash need more buffer for smooth audio
 #else
   #define AUDIO_BUFFER_COUNT           (3)
 #endif

radio/src/targets/common/arm/stm32/vs1053b.cpp

@@ -68,8 +68,8 @@
 #define SM_LINE1         	           0x4000
 #define SM_CLK_RANGE     	           0x8000
 
-#define SPI_LOW_SPEED                1755000
-#define SPI_HIGH_SPEED               9216000
+#define SPI_LOW_SPEED                1500000
+#define SPI_HIGH_SPEED              12000000
 
 #define VS1053_BUFFER_SIZE           32
 
@@ -305,6 +305,7 @@ static void vs1053b_mute()
     if (!_last_play_ts) {
       // we start the mute delay now
       _last_play_ts = now;
+      return;
     } else if (now - _last_play_ts < _instance->mute_delay_ms) {
       // delay not expired, we may not mute yet
       return;