 It is the TRRS jack breakout. That's what I was working with before Now we have that and you can plug in your TRRS cable here is a little Altoid tin MIDI converter that I built got a QT Pi and I've got my TRRS jack TRRS jack I'm using it to send MIDI data and so for that I'm using a TRS cable and that works fine stereo cable I'm going to use the QT Pi to play a couple of arpeggios and then change the patch This is just serial UART data. That is my product pick of the week this week. It is the TRRS jack breakout