Yamaha MFC2 is a MIDI foot controller designed to expand the capabilities of your WX7 MIDI Wind Controller. With the MFC2, you can quickly and easily recall any of 30 different programs (voices) on a synthesizer or tone generator, giving you access to a wide range of sounds. Each program number has 6 different parameters that can be programmed to add new functions to the WX7. For example, you can use the MFC2 to control two different MIDI channels simultaneously, allowing you to play two different voices at the same time.