Musicaid (Simmons) Analog Clap Trap synthesizer

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via this auction

"Here is a very rare Musicaid (Dave Simmons worked here before founding Simmons Electronics) original model Analog Clap Trap in excellent condition.
Manufactured in St. Albans UK.
There's a little blemish on the right side of the case - pictured.
The balance slider is a bit noisy and so might need to be spray-cleaned.
A piece of electronic drum/synthesizer history.

From Bob Henrit's Complete Simmons Drum book...
'While all this was happening around the beginning of the decade, another Simmons (Musicaid) product was proving to be very successful around the world. This was the ubiquitous analog 'Claptrap.' At one time it was impossible to turn on the radio without hearing its 'noise.' It was made because Dave Simmons spotted a gap in the market. He noticed that 'disco' records invariably had hand claps behind the snare drum off-beat to bolster and sharpen the sound. All that they needed to do was design a simple circuit that would sound like a recording of hand claps. That original, analog, and to some minds the best Claptrap, was a very successful Simmons product. It certainly enjoyed three or four year of success without actually being 'ripped off' as a free-standing unit. Its sounds, though, were frequently 'borrowed' by many drum machine manufacturers.'"