* On start-up the system will automatically enumerate and function
* as a USB speaker. Outgoing audio will output in 8-bit PWM onto
* the timer 3 output compare channel A for AUDIO_OUT_MONO mode, on
* On start-up the system will automatically enumerate and function
* as a USB speaker. Outgoing audio will output in 8-bit PWM onto
* the timer 3 output compare channel A for AUDIO_OUT_MONO mode, on