[sdiy] JRC 2090D anyone have specs? casio used these..

[Bob Weigel]

Thanks Samppa!  Yeah I figured turning up no google info.  There is just 
enough resonance from factory to start to get some decent clav voicings 
sort of.  -Bob

Samppa Tolvanen wrote:

> Hi.
>
> JRC 2090D is more likely a custom filter chip design for Casio.
>
> I was involved in a modification, where cutoff and resonance of the
> chip were brought under external CV control.
>
> It turned HT-3000 into a different kind of animal with very brutal
> filter sweeps and resonant zaps - highly recommended.
>
> I can ask, if my friend still has the service manual pdf.
>
> Samppa
>
> p.s. I think one of the earlier Casiotones was even more of "a proper
> analog" synth.. with that Knobby feelin'
>
>