(after having published more than 180 presets)
-display of joystick coordinate x y in real time
i think it is cheap to do,
the help provides by this one can save lot of search time.
i think it can be done for mod wheel pitch wheel and ruban too.
option : record joystick moves to get an egxy curve
-phase modulation (like the famous yamaha ...)
-unison voice number assignable as a modulation source
(example : you have 8 unisons voice, numbered from 1 to 8,
and you want to modulate filter cut off with an amount of +x (x=3)
voice number 1 will have 1 * 3 = +3
2 2 * 3 = +6
3 3 * 3 = +9
if it is easy to code, it can be a killer feature
(with this "feature" voice number can be assigned to different vca,
you can provide odds/even as modulation source too)
-reverb : i understand those who don't want one
but everyone don't have a reverb unit,
and it is potentiel artistic expression in a preset
i think a freeverb implementation is not over complicated
( in 96khz 32 bits, wouldn't it be lushy ?
i often feel to frustrated to only use delay.
-multi timbral : i think it will cost a lot ...
and you can already do this with keymap
maybe there is something more clever to do
with arp<->keymap first
and then multiplying the arp (like having 4 independant)
and last provide some option for arp+seq cumulation modes
(mainly with seq as a gate) in order to preserve polyphony
-next step is clever wave offset (to have serum like feature)
(i think very heavy to code)