That's a DINx4 you mean :) You don't need the AINx4 if you use encoders instead of pots, which I almost always do personally. A Joystick is two pots, spot on, and you would need the AIN for that.. Not sure why you have the LTC (LED/Thru/COM) module? You might want an LCD for troubleshooting, and a DOUT if you want any LED's for flashy lights. The code is a snap :) Have you seen the example app yet? Edit: Check this out :the becoming of the midibox axe