above photo from the collection of Joseph Rivers, Audio Playground, Orlando, FL
other synths in the Audio Playground Collection
The Sequential Drumtraks is an 8-bit sample-based drum machine. The samples were stored in EPROM (Erasable Programmable Read-Only Memories) chips, like the Oberheim DMX. It was possible, if you had a machine to "burn" the EPROMs (such as the Oberheim Prommer), to program your own EPROMs, and, therefore, to use your own samples. Sequential Circuits also sold replacement EPROM soundchips that they had sampled onto. What was unique about the Drumtraks was that for every beat each sample could be programmed to play a different velocity and a different pitch.