Comment 4 for bug 1744086

Echo on QuickEffect knob lacks the echo trail because it's pre-fader.

Yes, I'd like to have the benefits of both post- and pre-fader behaviour:
- post-fader for Volume fader, so you can also apply a certain ramping when turning down a track
- pre-fader for xFader to cut fast, to use it as toy (stuttering echo) or as emergency brake in case the effect tail is disturbing