I was thinking the same thing today... a 'Combinator II':
- Three rack spaces (or more) instead of two, providing more interface space to accommodate the extra controls.
- 12 sets of controls & buttons instead of four.
- Ability to toggle controls to display as either a set of rotary knobs or a set of sliders.
- Parameter readout shows the *actual* parameter value of the parameter you are tweaking, not simply a standardized number value unrelated to the parameter.
- No set limit to the number control-to-parameter mappings.
- Ability to import existing standard Combinator patches into the new Combinator II.
- Go for a default tan or dark tan brushed metal look to distinguish it from the original.
I know, I ask a lot...