I used to use them, but not so much anymore. The main thing I used it for was to turn the level of the effect up or down. The parameter adjustments don’t have anything to do with “better sound.” They mainly just make the effect sound “bigger” (more “echoey” or reverberant) or “smaller.”
Wayne A. Pflughaupt
"A nice mid-fi system," according to an audiophile acquaintance.