Hi :) There is no bypass button in MixEmergency, but you can assign a MIDI button to the wet/dry mix that allows you to toggle the effect on and off (similar to a bypass). It is something that I've had requested before though, and have looked into the possiblity. Keyboard shortcuts for triggering effects and transitions are really a high-priority right now - as they introduce other issues, such as short-cut conflicts between MixEmergency and Scratch Live, which can prove to be confusing. A MIDI controller is really the best thing to use right now.
