Large envelopes (was: Re[2]: I

[Haible Juergen]

>      The ADSR output is quite large, potentially 15 volts peak. I did this 

>      on purpose since attenuating is easier than amplifying, and besides
15
>      octave VCO sweeps are sometimes fun. Better to have huge signals and
>      level controls. However to keep things standard, especially in
>      "normalled" systems, it's good advice to use the 2K/2K trick so you
>      can patch an ADSR straight into the VCA for example and maintain
unity
>      gain.


Large envelope levels have one very strong point for them:
If you use them on VCAs with a cheap one-transistor current
source, the Vbe threshold, relative to the peak ADSR level,
is smaller. So with long Attack times, the delay before the
actual attack phase starts is shorter.
I think the early SSM2050 was designed for 10V amplitude.
The later SSM2056 has 5V, as well as the Curtis 3310.
One more reason for the Rev 2 Prophets being more "punchy" ??
Just a thought ...
Does any one know why SSM changed from 10V to 5V ?
And why Curtis even started with 5V? Just wondering, because
I thought the 3310 were first used in (and even develloped for ?)
the OB-X - and the SEM had 10V envelopes!
Comments / ideas / corrections welcome!

JH.