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Re: [motm] My take on this EG thing.

2004-09-03 by Scott Juskiw

>But, am I understanding some folks want hold between A and D?
>If so, I do not understand.  I am doing my favorite imitation of Stooge
>Larry in a Lucille Ball outfit asking Ricky to "splain" it to me.

Draw this out (in your head or on paper): a gate is applied to the 
EG, the EG output starts at 0 volts, attacks to +5V, immediately 
decays down to +2.5V (the sustain level) and drops back to zero when 
the gate is dropped. That's your standard ADSR envelope. Now draw a 
horizontal line at +3V and erase everything above the +3V line. 
That's your AHDSR envelope. It attacks then holds before decaying to 
the sustain level. It's good for adding punch to percussive sounds. 
It seems to over emphasize the attack, almost like having a limiter. 
Think of it as simply a "clamped" envelope.

I can think of two ways to do this with MOTM. The easiest is to use 
an Oakley Wavefolder to clamp the output from an MOTM-800 so that it 
doesn't go above N volts. Apply the 800 output to the Wavefolder 
input. Use the CLAMP output on the Wavefolder. Set the GAIN to 8, the 
THRESHOLD to 2. Granted, that's not an MOTM module.

Another way is to use an MOTM-700 and a MOTM-830 (or JLH-822 or 
Oakley multimix with my mods so that it can act as a DC source). Run 
the MOTM-800 output to the CV and IO A inputs on the 700. Plug a DC 
source (the 830 or 822) to the IO B input. Set the MODE to VOLTAGE 
and the SWITCH level to +3 on the 700. Take the clamped EG output 
from IO X on the 700. You'll have to tweak the DC level so that it 
perfectly matches the SWITCH level to avoid any clicking from 
discontinuity.

There may be other ways, but these two work, I just patched them up to verify.

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