anyway to emulate this with an eg, cp251, etc?
"The Attack control circuitry uses two envelope generators. The first follows the shape of the original curve rendering conventional Attack and Release controls superfluous, while the second generator produces the envelope Env 2 with a slower Attack. The hatched area shows the difference between Env 1 and Env 2, and the VCA control voltage is derived from this difference. Positive Attack values emphasize Attack events, negative Attack values smooth out the Attack envelopes of events.
The Sustain control circuitry
The Sustain control circuitry includes two further envelope generators. The envelope follower Env 3 again follows the shape of the original curve rendering conventional Attack and Release controls superfluous. For a longer period the envelope generator Env 4 holds the sustain level according to the peak level and the VCA control voltage is generated by the difference between Env 3 and Env 4. The sustain is extended at positive settings and shortened at negative settings."
