message: AudioSDWriter: clarify comments
diff: @@ -184,7 +184,7 @@ class AudioSDWriter_F32 : public AudioSDWriter, public AudioStream_F32 {
  unsigned long setStartTimeMillis(void) { return t_start_millis = millis(); };
  protected:
  - audio_block_f32_t *inputQueueArray[4]; //two input channels
  + audio_block_f32_t *inputQueueArray[4]; //up to four input channels
  BufferedSDWriter *buffSDWriter = 0;
  Print *serial_ptr = &Serial;
  unsigned long t_start_millis = 0;
  