[sdiy] Polyevolver internals

[Eric Brombaugh]

On 12/29/2009 02:14 PM, Tom Wiltshire wrote:
> Hi All,
>
> Does anyone happen to know what voice processors are inside the DSI
> Polyevolver/Evolver? Alternatively, are there any good internal photos
> of one of these opened up?
>
> I've had a hunt about, but I didn't find anything.
>
> Background: After the recent discussion about the Prophet 08 DCO glitch,
> I'm spending my Christmas holidays messing around with DCO designs based on
> dsPICs, just like Dave Smith did. What's intriguing me is what he used
> for the *digital* oscillators in the Polyevolver - are they generated by
> the same uP? How many uPs per voice? Or put another way, how much did
> DSI manage to squeeze out of these chips, and can I hope to do better?
>
> Thanks for any pointers,

I found this site:

http://www.hispasonic.com/comunidad/evolver-inside-t243152.html

You can see that he's using the PA397 for the DCO there too.

Stephan Tippler's site indicates that the Evolver's digital oscillators 
are generated in the DSP, which appears to be an Analog Device 
ADSP-2191. A lot more going on in that part than in a dsPIC.

Eric