USE CASE: multiple quantizers for different polyphonic voices in a patch. I use an Stoermelder 8Face Mk2 to save presets of those multiple quantizers, so I can change key of (for example) a lead melody & bassline at the same time.
Rack has a Module (the guts) & ModuleWidget (the controls) design.
How difficult would it be to have many modules (implemented as expanders, perhaps?) all controlled by the same ModuleWidget?
In my dreams I can imagine this as a generic thing, where you can have a module, then add a module-expander that just attaches a new Module to an existing ModuleWidget.