This is a footswitch to control a software looper on a Mac , SooperLooper. It sends keystrokes to the Mac to trigger processes such as Record/Play , Overdub , Mute, Multiply , Solo , Undo , Redo , Volume up , Volume down , on each of four tracks . Tracks are chosen by pressing the green buttons. There are 7 leds on each track that light up when a process is initiated , some processes effect multiple leds on different tracks.
I used a Due , let the leds run off 3 volts , there are never many running at any one time.
