Re: Mixology 201: Effects
For FX that should tail out with the music, input side control insures that you cut the feed to the FX unit, but the reverb tail still emerges completely as the music dies out.
For things like a tap delay, slapback verb, reverse verb, or other "special" effects, it is often easier to manually ride the FX output side to control the decay tail than to get it set up perfect in regards to decay via the FX unit control parameters.
For something like a tap delay, which might have several different delay times on different songs, and require a different number of taps on each song, manual fader rides are often most expedient.
