[sdiy] SEM filter questions

[Neil Johnson]

Magnus Danielson wrote:
>> Nah. While Oberheim did use some CEM and/or SSM chips for things like
>> ADSRs and so on the filters were 2-pole SVFs based on CA3080s.
>
> Oh really? For what synth are you talking about? It really changes over
> the years.

I was focussed on SEMs.  It may well be that later OBs used more 
esoteric chips.

> SEMs use really standard stuff. The CA3080 is as special as it gets.

I did look at an OB-X a few years ago, and I'm pretty sure that had 
similar 3080-based filters.

> OB-X is really SEM like filters, but when you get to OB-8 it is all
> modernized.

I couldn't possibly say, having neither owned an OB-8 nor looked at its 
schematics.

Cheers
Neil
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