This is the monster MIDI mastercontroller keyboard that the desk is designed to accommodate: a Kurzweil MIDIBoard rev 2.4. I got this for (I think) $300 in perfect working condition from the Detroit Film Center. 88 keys of true hammer action, instead of that simulated hammer-under-the-key design that most weighted mastercontrollers use. It needs a cleaning.
You know, it concerns me that I can't remember exactly how much I paid for this.