Just FYI. I updated the WAV Trigger serial control Arduino library with new WAV Trigger features, an example sketch (included in the library) that demonstrates things like looping, cross-fading, pitch bending and starting multiple tracks in sample sync. Library now supports hardware serial port options - see the readme for instructions. I also posted a basic serial control tutorial (with a link to the library) here: http://robertsonics.com/2015/04/25/ardu … -tutorial/.