I still have one of these.
Its far from the best 303 clone, but not a bad little
mono synth in it's own right. Its quite beefy sounding
You
are not missing much with the manual. Its more of a pamphlet! To filter external audio,
you need to have the Waveform switch set to "X" and incoming midi note data to act as a
gate/trigger.
As for internal tweaks. I have never tried it. Although I have
taken the lid off to have a nose around inside. But the manual doesn't tell you anything
about the internal trim pots anyway.
If I remember rightly, James Walker was
the main man behind these synths. And although 'Sound Control' no longer exists (Does it?)
James can be found here
www.synthrepairservices.com So if you need any technical info, im sure
you could contact him. Which I may do myself soon, as 1 or 2 pots on my DB9 are slightly
iffy. I'll repair it myself, I just need to know what the suitable replacements pots
are.
If there is anything specific you want to know from the manual, just ask
and i'll fill you in. But it's a pretty rudimentary manual. Then again, so is the
synth!
Paul
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Paul