[sdiy] Weird Vocoder project

[Tom Wiltshire]

On 31 May 2007, at 13:08, Steve Ridley wrote:

>
>
>>> No, it isn´t. - You probably meant SSM2164?
>
>> Yes, sorry, my mistake. SSM2164 is the quad VCA that's still being  
>> made.
>
> The problem with the SSM2164 is it has an expo response, so it's
> response won't match a standard cheap & cheerful envelope follower
> in a vocoder application.
>
> Options might be to linearise the response of the SSM2164 using a log
> converter or another section of the 2164, or use an RMS envelope
> follower like the THAT2252 (or combined EF and VCA in the THAT 4305).
> But that's going to cost $3 - $5 per channel.

Well, back to the SA570/571 then!

Actually, between the Env Follower / VCA difficulties and the filter  
problems that others have mentioned, it looks a bit like it probably  
isn't worth the effort.