Example sketch by Dnstje.nl

// Simple advanced MP3 file player example
//
// Requires the audio shield:
//   http://www.pjrc.com/store/teensy3_audio.html
//   or dac / pwm / SD shield
//
// Example sketch by Dnstje.nl
// Act like a real MP3/AAC player up to 255 songs.
// Buttons at port 14 15 16, feel free to remap them.
// I don't have a Audioboard yet, just a SDcard breakout and using the
onboard DAC and PWM outputs.
//
// This sketch will also using: EEPROM, Bounce library, Serial, SD.
//
// Sending char's to serial port to change tracks.
// P = previous track, N = Next track, S = Stop track, O = Play track I
= Pause track, K = list tracklist, C = current track, R = Random track
selection.
//