Helix run through the effects return of a Fender or Hughes and Kettner , most amp models sound discontinuos and harsh. Cab Sims are off using amp models only. Many of the FUZZ and Distortion pedal attacks and sounds also too harsh. Set uo for instrument in and line out. Added EQ's for and aft of the amp in every configuration, lowere hugh cuts globally and yet nothing excpet the cleanest of modles sounds usable. Does anyone have a clear and concise set of intructions to get the best possible setup for live rig using the Combo amp as a power amp.