SpecDrum

SpecDrum

SpecDrum was an inexpensive drum machine, which, unlike most standalone drum machines, was a peripheral for the popular Sinclair ZX Spectrum home computer. It was released by Cheetah Marketing in 1986. It was notable for its low retail price of £29.95 [ [http://www.ysrnry.co.uk/articles/specdrum.htm Your Sinclair, March 1986] ] , when standalone alternatives typically cost around £250-£300 for a similar functionality. [ [http://www.worldofspectrum.org/hardware/feat42.html Popular Computing Weekly, October 1985] ]

The device connected to the expansion bus on the ZX Spectrum. The ZX Spectrum ran software that was used to program rhythm patterns, and chain these into songs. Patterns and songs could then be loaded and saved onto cassette tape.

The SpecDrum was an 8-voice machine (i.e. it allowed the user to load 8 different percussion samples). However it only had 3 output channels (i.e. maximum polyphony of 3 samples at a time) - the first channel could trigger the 'bass drum' voice, the second channel was used for the three snare/tom voices, and the third channel for the remaining four samples.

The standard kit consisted of bass drum, snare drum, mid and low tomtoms, cowbell, hi-hat open and closed and hand claps. The sound has been compared to that of a LinnDrum. [ [http://www.engadget.com/2005/10/28/music-thing-the-zx-spectrum-specdrum-module/ Music Thing: The ZX Spectrum SpecDrum module] ] Cheetah also sold 'electro', 'afro' and 'latin' kits on cassette, which could be loaded into the ZX Spectrum in place of the standard one. In addition, software was available enabling the user to sample and build their own custom kits.

The SpecDrum could also, in principle, be synchronized to other musical equipment, using a sync pulse sent and received from the ZX Spectrum's "ear" and "mic" audio input/output sockets. [http://www.crashonline.org.uk/27/specdrum.htm Crash 27: Specdrum] ]

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