Aus der Anleitung:
ENV OUT (Filter EG)
This output provides a control-voltage signal created by the current Filter
Envelope Generator panel settings.
…
ENV END OUT (Filter EG)
Once the Filter Envelope Generator has run its course and returned to its lowest
level, a Gate signal is created and continuously output via this jack until a new
envelope cycle is initiated via a keyboard or trigger input. This Gate signal can
be used to initiate another event, such as advancing a sequence to the next step.
TIP: Patch from the ENV END OUT jack to the TRIGGER IN jack on a single Envelope
to create a looping envelope. Shorter Attack and Release settings will yield more
rhythmical results.
CV OUTPUT: 0V to +5V
Also ENV END gibt ein Gate Signal, wenn der Envelope fertig ist. Und wie im Tipp beschrieben, kann man damit einen Envelope leicht zum Loopen übereden.