## negative sustain

Scope and XITE Development

Original topic on PlanetZ: https://forums.scopeusers.com/viewtopic.php?t=4284

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Posted: Mon Feb 18, 2002 4:12 am
by at0m
The Sherman filterbank has negative sustain on it's ADSR, never seen this done elsewhere. It provides mastersweeps!
Maybe it's easy to do on DSP, I don't know. I suspect this requires different ADSR, but maybe is can be done via modulation/offsets or something.
http://www.sherman.be did it the analog way, I think he'll be glad to assist when you would try it to!!

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Posted: Mon Feb 18, 2002 9:32 am
by Neutron
does it just mean that the sustain is below 0 and then the release sweeps UP to zero? if so it would not be too hard.

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Posted: Mon Feb 18, 2002 9:52 am
by at0m
that's correct. I did not mean Env. Inversion, that's done before.
Like in:
'value'(after attack)=100
'value'(after decay) = -50
This new Sustain value will be pos/neg. inverse to Env. Depth, which is the 'value'(after attack).

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Posted: Mon Feb 18, 2002 10:25 am
by at0m
http://www.sherman.be/extras/manual2en.pdf p. 24-33 explains the ADSR

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Posted: Tue Feb 19, 2002 11:44 am
by Neutron
yes it can be done quite easilly.