Back on topic: We can set aside the control exotica mentioned earlier in similar threads (assignable LFOs, envelopes / followers, step sequencers …)
Let’s start fairly simply: An A/B Performance Parameter, triggered by (any) footswitch, controlling the current EXP pedal(s) mapping, or even to the [P] [A] HotKnob assignments.. Momentary / toggle / latching (H-T; T-H). Wide range, variable rise / fall times a must. Bonus points for EXP / LIN / LOG curves.
