In-Line Effects Drumfire Analog Drum Synthesizer SN 18249

via this auction

"The Drumfire DF-500 is a 5 channel drum synth module. The 5 channels are identical, with their own Trigger-In and Audio Out sockets.
Each channel is a mini analogue synth drum module, capable of producing a wide range of electronic drum sounds, and since every parameter is defined by a knob, it's highly tweakable.
The 5 drum channels also have their own level and pan pots, and the signals are mixed to a pair of stereo outputs with Left/Right volume control.

Each channel has 9 controls (8 knobs & 1 switch):
SENSITIVITY controls pickup/trigger in sensitivity
OSCILLATOR DECAY controls decay time of the synth oscillator
NOISE DECAY controls decay time of the noise sound
SWEEP alters oscillator frequency
CLICK (Switch) adds a click sound to the attack
PITCH changes oscillator pitch
BALANCE controls balance between oscillator/noise
VOLUME output volume to mixer
PAN L/R balance control, also allow dual output on L/R jacks

Since it has individual audio outputs, the out could be patch back/daisy chain to the next channel's trigger input, so cascading up to a 5 oscillator synth drum sound!"