Question What functions do the various pins do on the MIDI In, Out and Thru connections on the VoiceLive 2 Answer The 5 pins have the following functions: Pin 2 (GND), Pin 4 (DATA+) and Pin 5 (DATA-).  Pins 1 and 3 are not connected on all three of the MIDI connections (In, Out, Thru) and therefore serve no function.