Cactus Desert Drums

via this auction

"The Desert Drums drum module synthesizer from British manufacturer Cactus. It was produced in the 1983 and was also part of a full electronic drum kit but could also be used standalone in a synthesizer rig.It is an early hybrid instrument that is both analog and rom based. The unit's drum sounds are sample based burned onto an E-Prom within the 6 standard modules including one fully analog synth module for creating synth drum sounds. More modules can be added to the unit should the user desire to expand it up to 10 modules.

There are controls for volume, panning, pitch, decay, and trigger sensitivity. On the Snare module, you can mix the sample with analog noise and shape it with a resonant analog filter. The Bass drum module allows you to switch between two separate samples. The other standout module is the Synth sound, which provides versatile controls for the noise, tone and click components of a synthesized percussion voice. Each module has an individual output, while a 15-way 'D' socket facilitates connection of the entire chassis to an external computer or sequencer."