Comment 7 for bug 1481170

I think two buttons is way better than a three state one: one button to open/close input signal and another one to enable/disable the output processing (effect on/off). This way we can add the input on/off button as an effect parameter only to those effects for which it makes sense (e.g. it makes sense in a reverb, but for a bitcrusher there's no difference between closing the input or the output).

Another idea: what if we make something similar to release effects in pioneer rmx devices? Users have several ways to disable the effect:
-Cut: simply stop processing the effect, what Mixxx does now.
-Spinach
-Echo / reverb
-Whatever...

This would work by disabling the effect unit but enabling an internal effect unit for a predetermined amount of time.