Ok @tehn here goes …
The 128 is the mixing surface. And the metering surface.
It plugs in to a seperate I/O box that has all the audio connections, power, maybe secondary knobs.
I’m sure there’s max monome mixer apps out there as a reference.
Straight away there’s 16 channels, with 8 step resolution. Varibright can give higher resolutions.
Dedicate a column to mode / page changes.
Dedicate a col to the master channel.
Two cols for the fx return levels.
So down to 12 columns, ie channels. Plenty. Could be 6 stereo pairs.
Mode Page 1 : mixer levels.
Page 2 : pan
Page 3 : mute / solo ?
Page 4 : aux send
You get the idea.
You could certainly mock this up in max, with a MIDI controlled mixer … But I have no skills in the former and I don’t have one of the latter either.
We don’t need a mixer. We need a slight rethinking of the aleph as an I/O hub?..