void help() {

Serial.println(F("Microduino AudioPro Library Example:"));

Serial.println(F("COMMANDS:"));

Serial.println(F(" [0-9] to play a track"));

Serial.println(F(" [a] to Set Amplifier"));

Serial.println(F(" [s] to stop playing"));

Serial.println(F(" [p] to pause or unpause"));

Serial.println(F(" [s] to stop playing"));

Serial.println(F(" [+ or -] to change volume"));

Serial.println(F(" [> or <] to increment or decrement play speed by 1 factor"));

Serial.println(F(" [m] Toggle between Mono and Stereo Output."));

Serial.println(F(" [d] to toggle SM_DIFF between inphase and differential output"));

Serial.println(F(" [r] Resets and initializes VS10xx chip."));

Serial.println(F(" [f] turns OFF the VS10xx into low power reset."));

Serial.println(F(" [n] turns ON the VS10xx out of low power reset."));

Serial.println(F(" [i] retrieve current audio information (partial list)"));

Serial.println(F(" [l] Display list of music files"));

Serial.println(F(" [h] this help"));

}