Schlappi Engineering Boundary Layer

I was looking for an envelope generator that could work well for drum sounds.
This is it.

Easy control over rise and fall and a cycle switch for each channel so can act as a nice Lfo that you can sync.

But the cv control over the slew amount makes it the best EG I’ve used for drums. In log mode (switch up) you can get short gated sounding slopes but in exp mode the slew control allows for extremely fast voltage drops. Couple that with a long decay and you can create a seriously punchy kick.

Second best feature is the bound input which gives you cv control of the envelope amplitude when being triggered. Super effective for velocity changes or hat rhythms.

Each envelope has an end of cycle output and there’s headers on the back to switch between end of the rise or fall cycle.

Global trigger or gate control and then 3 summed outputs that give you a max, average and minimum value of the active envelopes.
With a little extra patching you can also create a functional adsr.