[sdiy] Virus envelopes (was Re: Fast envelope generation)

[KA4HJH]

On Dec 19, 2012, at 7:07 AM, Tom Wiltshire wrote:

> 
> On 19 Dec 2012, at 01:55, Russell McClellan wrote:
> 
>> I remember being quite impressed with envelope section in the Access
>> Virus digital synth manual - nominally, it only has linear envelopes,
>> but you can use the modulation matrix to produce exponential or log
>> curves by routing the envelope level back to the attack, decay, or
>> release parameters.  I think that's a clever and intuitive UI for
>> users and it must have been relatively easy to implement.
>> 
>> Did this idea come from some analog device?  I'd be quite surprised if
>> it didn't and it very much has the feel of buchla or serge or some
>> banana system.
> 
> The Oberheim Xpander/Matrix enabled something similar. This is mentioned in the Owner's manual ("Creating very long or unusual envelopes"), so it's clearly something Oberheim thought about.


This technique is also used with the LFO in the PAiA Hyperflanger to change the waveform from a linear ramp to an exponential ramp.


Terry Bowman, KA4HJH
"The Mac Doctor"