HI!
Bandreject and Bandpass filter bandwith would be a great feature in filter section.
Also an envelope fade in for LFO-s and delay for Envelopes would be nice.
Filter bandwith / LFO Fade in / Envelope delay
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For the fade in you could assign one of the unassigned free envelopes (3 & 4 i think) to the modulation amount.
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And also:
LFO3 has fade-in.
You can make an adjustable-width bandpass out of the two main filters in series: one HP one LP with some overlapping frequency range.
You can make an adjustable-width bandstop out of the two main filters in parallel: one HP one LP with no overlapping frequency range between them.
Hope this helps. Envelope delay has been on my request list for a while, along with note-off triggered envelopes and LFOs.