That hasn't necessarily been my experience. True, there are some patches that will need tweaking to sound better after inserting the epsi, but for the most part the epsi has made existing patches sound better if not perfect with no tweaking. I don't do too much with low or mid gain tones so my experience generally has to do with a good high gain lead with delay and chorus, or clean with delay and chorus. You may find it needs less work than a complete reset of your patch. YMMV..