I do not know how exactly could this be useful so please forgive me if not aplicable here. This new pipe could be used to create more interesting results combined with the lfo pipe. This can be triggered to exist at a per note basis as usual but it could be free as well, maybe with a beat time signature to follow the line and then stop as single or loop? A Looping envelope could produce interesting cc movements to modulate anything. So more “modular” style experiments can be exposed as midi cc messages.
Some additional info
Four envelopes with different types and trigger modes affect any sound parameters you choose.
Each envelope can be either polyphonic or single trigger. This is especially interesting with the monophonic voice allocation, as the filter envelope can be set to be triggered only by the first note(s) while the Amp Envelope is triggered anew (i.e. on each note). Think “organ percussion register”, for instance.
The Envelope types include the standard ADSR as well as an enhanced ADSR-variant (with controllable attack level and two decay and sustain stages), two different loop envelopes and a “one shot” Envelope.
The Loop types can be used to act as additional LFOs, while the One Shot is perfectly suited for percussion sounds (which typically ignore the note release).
Example use for blofeld synth