PEARL DRX-1 Electronic Drum Module Analog Synthesizer / Brain SN 000371

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via this auction

via the seller: "I do believe this unit was also branded as the DRUM-X (please correct me if I am wrong).

The Pearl DRX-1 has 5 Instruments which can be triggered by drumpads. Of course you can also feed some trigger-signals into it. All intruments have the same parameters and are therefore sounding identical, although the pitchranges are a little different. Beside Bassdrum there is the Snare and 3 Toms. Each has its own trigger-in and an individual out jack, 6.3mm (1/4"). If you do not use the individual jacks, all sounds are summed together to a stereo-out. Very solid, professional and expensive hardware.

You have 8 kits to save your parameter sets. the kit-selection buttons recall the kits immediately, you can switch them live in the song to change the sounds.

To edit the sounds you select a pad (=sound), with two buttons (+/-) you select the parameter and with two other buttons you can increase/decrease the value. The range is from 1-19 for all parameter."