VC envelopes, MIDI2CV

[Mikko Helin]

   Hello list,

   Do you know if it's difficult to use a VC slew rate controller as an envelope
   generator when connected to two DAC's which are then controlled by computer or
   microcontroller? I have an idea to use a multichannel DAC (32 channels) to
   control four channels (mono or poly) of analog stuff and generate eight
   envelopes with VC slew rate limiters. For one EG two DAC channels are
   needed, one for rate and the other for actual data values. I guess LM13600's 
   or even optocouplers (4N37) could be used to control EG times. I've also found
   a little MC51 compatible MC with 128 bytes RAM and 2 kB FLASH in a 20 pin package 
   (Atmel's AT89C2051 -> www.atmel.com) that seems easy to be used in this kind of 
   project. I think 8-bit DAC is okay, if control range of slew limiter is wide
   enough, but only 128 bytes of RAM may be a problem.


   Mikko