Product description "Buchla U.S.A. - 230 Classic Reissue - Triple Envelope Follower"
The redesign by Roman Filippov (Black Corporation) generates three sets of control voltages and pulses relative to the amplitude of the signal inputs. Sensitivity and decay time can be adjusted per channel.
The Triple Envelope Follower can be used for a variety of applications, such as generating CV signals or simple envelopes from drum triggers or other transient-rich audio sources.