 //A simple chord player for teensy + audio which allows 
 // selection of the most common chords in pop 
 // (e.g. I, ii, IV, V, vi) with some decorations.
+
+// Hardware setup: 
+// * 4 potentiometers A0 - A3.  A3 could be logarithmic, as it is for volume.
+// * 4 buttons connecting p3-p6 to ground (configures them to use internal pullup resistors)
 
 // GUItool: begin automatically generated code
 AudioSynthSimpleDrum     drum2;          //xy=58,80


  if (millis() == next)
  {
    for(int bn = 0; bn < 4; bn++){
      buttonStates[bn] = digitalRead(3+bn)==LOW;
    }

  sgtl5000_1.volume(0.5);

  AudioInterrupts();
}

void showButtonStates() {
    Serial.print("buttons ");
    Serial.print(buttonStates[0]);
