BOSS Dr. Pad DRP-1 and DRP-2

DRP-1 images via this auction

Details
"MAKE: BOSS Dr. Pad
MODEL: DRP-1

FEATURES:
Great sounding Vintage Drum Synthesizer with six preset sounds ( snare drum, snare drum 2, tambourine, hand clap, cymbal, and timpani) and adjustable settings for Time-Sweep-Range, Decay, Pitch Sens and Pitch.
The Rear panel has controls for level and sensitivity. 3 Standard quarter-inch jacks provided Output, Trigger and Mix.
The output jack is also the off on control which turns the unit on when the jack is inserted."

DRP-2 images via this auction

Details:
"FEATURES:
Great sounding Vintage Drum Synthesizer with six preset sounds ( bass drum, bass drum 2, E. Tom, Steel Drum, Gong-S, and Star Chime) and adjustable settings for Time-Sweep-Range, Decay, Pitch Sens and Pitch.
The Rear panel has controls for level and sensitivity. 3 Standard quarter-inch jacks provided Output, Trigger and Mix.
The output jack is also the off on control which turns the unit on when the jack is inserted."

Update via bestonline323 in the comments:
"you can find an amazing sample at http://www.keyboardmuseum.com/d_machines/drpad1.html I love this thing it is practically my baby. Seriously. Great post!"