[sdiy] Env gen question

[Tom May]

Tim Ressel <madhun2001 at yahoo.com> writes:

> On envelope gens like the MOTM, where is a "+" and a
> "-" output, I assume the "-" output idles at 10v and
> goes towards 0v as the envelope progresses. This is
> opposed to being a simple invert where 0 to +10v is
> inverted to 0 to -10v. 
> 
> Can anyone verify??

No, but I can put in a plug for having an EG that idles so that the
sustain level is 0V.  I.e., just subtract the sustain level from a
normal EG output.  Why is this useful?  When you turn up the amount
knob on the filter the EG is controlling, you just get "more" envelope
without having the filter open wider during the sustain.  With a
normal EG output you have to turn the filter's frequency down to
compensate for turning the EG amount up if you want the sustained
portion to sound the same.

Tom.