I found and purchased the perfect USB controller for this template:
Korg Nanokontrol 2
8 parameter knobs
8 parameter scene buttons
8 arrangement scene buttons
8 master scene buttons
8 volume sliders (just add a page button and some lines in the Midi-In script and these 8 sliders can control either the first 8 or second 8 volumes)
3 page buttons
8 option buttons
nice