via this auction
Via the seller: "I was recently clearing out some BBC Micro stuff and came across this Clef PDSG (Programmable Digital Sound Generator). It was the last product made by Clef. They hoped it would be taken up by Acorn computers, but it didn't happen, and I think they went out of business after that. It was supplied pretty much as seen, as a DIY project. I initially couldn't find any mention of it online, so I've put up a page to commemorate it here, with pictures and sound samples:
http://www.lemontiger.co.uk/clef.html
There's some information about it here:
http://audiotools.com/en_mi_dead_b.html
"In 1982 the company introduced the product it is best known for these days in the form of the Clef Microsynth (Later the B30 Microsynth), a budget 2 oscillator analogue subtractive synthesiser that was the only product sold by the company that was not developed by Mr. Boothman but rather a design originally published in P.E. magazine as a construction article and conceived by Allan Bradford, it is similar conceptually to the slightly more complex Jen SX-1000 and EDP Wasp in that it uses digital electronics to keep down costs but with it come some operational oddities such as the use of a 0.35V/Octave control voltages meaning that the only other synth that it interfaced with was the EMS, but it was cheap and thus sold reasonably well.
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