Killer Guitar Sounds? Maybe...Guitar multi FX units are undoubtedly one of the best value-for-money tools available to today's guitar player. Even a cheap multi FX unit found on eBay will house some great sounding effects to brighten up or add interest to even the most mediocre guitarist's playing.With so many different guitar sound effects available in the typical multi FX unit it is a great temptation to try and use as many as possible. However, that temptation could also destroy your credibil...