ExpressionMate is a MIDI co-processor that is attached to any MIDI instrument to add extended MIDI controller capability. ExpressionMate is comprised of a desk-top or keyboard-top Control Box and a connected 600mm Ribbon Controller copied from the K2500 long ribbon.

The Control Box has three arpeggiators that can be synched to MIDI or run asynchronously with real-time user control using the included rhythmic templates. You can transmit MIDI data on three separate MIDI channels at the same time, re-map your MIDI controllers as well as merge the two MIDI inputs provided. The Control Box also has provisions for Breath controller inputs from Yamaha's BC-1, BC-2 and BC-3; two footswitches or pedals; and two, programmable front panel "soft" buttons to transmit specific MIDI controller data.

The Ribbon Controller can be used as a single long controller or "split" into three separate zones. You can send MIDI note on/off messages, tempo and other data on a "per zone" basis. Each ribbon zone can be set to respond to "absolute" or "relative" positioning with or without "spring back" to center starting position when you lift your finger. The ribbon can be operated as a handheld instrument or placed on any surface with the cord extending from either the left or right side.