Couldn't you deactivate the previous effect you use on the MIDI controller first, then change to another on the SP-2? That's only one movement more than clicking the on/off switch on the SP-1. We only have two feet (unless you're an extremely dominant or unlucky human), and one needs to keep us balanced unless we're sitting down. We can only use one at a time, but I know what you guys mean about leaving them activated while using other effects on top.