In the words of Disaster Area Designs:

The first controller designed specifically to interface with quarter-inch MIDI devices.

Simply connect your MIDI devices to the qCONNECT ports, then use our

comprehensive setup menu to configure the port assignments and device

routing. All of the qCONNECT ports can send MIDI on the ring (Chase

Bliss) or on the tip (most other brands) without using jumpers or DIP

switches.