Comment 23 for bug 1481170

Yes, the "automatic" way will be finally the best way. A preference option for every effect will work for me.
This will also work for external effects, great!

I think we should also we should keep a single button with right and left click to keep th interface easy
The button may becomes then an "input_enabled" + a "start_fade_out" once the fade out parameter is set.

Do we actually need the to target the fade out for an effect like bit crusher, or can we rely on the dry/wet button?