Most MIDI devices don't have enough parameters to control all the dials across all channels at once.
Instead of leaving it up to the device to implement a way of switching CC values, we could allow CC combinations or other CC commands to switch to sets of assigned CC controls.
For example, the OP-1 has four rotary encoders, all assigned to CCs on rotation and on press.
To create a "set", you assign the four encoders to parameters such as Total Level, Multiple, First Decay Rate and Release Rate on OP1 and then assign a button to switch sets, which could be now assigned to OP2, or OP3, etc.
You may also want a button to temporarily activate a set when pressed and return to the previous set when released, for channel navigation, as an example.
Some sort of highlight on assigned parameters may also be useful.