Oberheim DMX

The DMX is a programmable digital drum machine manufactured by Oberheim Electronics. It was introduced in 1981 at a list price of US$2895, and remained in the company's product line until the mid-1980s.

The Oberheim DMX was the second digital drum machine ever to be sold as a commercial product, following the Linn LM-1 Drum Computer in 1980. Its popularity among musicians of the era contributed to the sound and evolution of 1980s new wave, synthpop and hip hop music.

Immediately following the success of the Linn LM-1, other manufacturers began to develop and release drum machines intended to compete with the LM-1's ease of programmability and realistic sound quality. The DMX featured sampled sounds of real drums, as well as individual tuning controls for each drum voice and a swing function. In addition, it boasted several humanizing elements such as rolls, flams, and timing variations that were meant to mimic those of real drummers.

The DMX features 24 individual drum sounds derived from 11 original samples and allows for a maximum 8-voice polyphony; one voice per card. It also featured eight separate outputs for individual processing, and allowed up to 100 sequences and 50 songs. One of the distinguishing features of the DMX is that it allowed integration with Oberheim's proprietary interfacing system (the Oberheim Parallel Buss) that pre-dated MIDI and allowed Oberheim equipment to be synchronized with the machine. Later models included factory-fitted MIDI ports and third party companies also manufactured MIDI interfaces for the DMX.

Drum and percussion samples are stored in EPROM chips placed on removable voice cards. The data format is 8-bit PCM using μ-law companding, increasing sound resolution to approximately 12 bits in the analog domain (a design technique also employed by other early drum machines, including products by Linn Electronics, E-mu Systems and Sequential Circuits).

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