AW: Transcendent Polysynth

[Peter Haaf]

Haible Juergen wrote:

>         >I use four of the voice cards with an
>         >appropiate power supply for a polysynth, driven from a Design
>
> Labs PROLOGUE
>         >midi-CV box. It sounds very nice, especially with each VCO
> having a
>         >separate LFO for PWM and vibrato.
>
> Sounds impressive - Congrats !
>
>         >The VCF is based around two halves of
>         >LM13600. Do these sound different to a LM13700?
>
> If you don't use the internal buffer (darlington) stages, they are
> exactly
> the same.
> The buffers stages, however, are different. The 13700 buffers have
> rather
> high impedance (but still rather low for accurate tracking of low
> frequencies),
> the 13600's are rather low impedance from the start, but the impedance
>
> is
> tracking with the ota's bias current.
>
>         >Oh yes, the other great thing about the Tim Orr polysynth, is
>
> that it has
>         >no fancy digital hardware for its keyboard interface. Just 74
>
> chips and a
>         >couple of SRAMs. No midi mind, but it can control 1,2,4 or 8
> channels of CV
>         >and gate.
>
> I *love* keyboard interfaces that are built from standard MSI chips !
> (Just played for an hour on my OB 4-voice keyboard clone yesterday
> ...)
>
> What exactly is this "Tim Orr Polysynth" ?
> I'd love to see documents for this one !
>
>         JH.
>

As far as i know, the Transcendent Polysynth was published as a diy -
project inElectronics Today International, and later as a german
translation in Elrad.

Peter

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