Hello! Do you know which channels are activated in the Engl Screamer using the Z4 footswitch?. The channels are: Clean, Crunch, Lead, High gain lead. I suppose it's this way: Both switches off: Clean channel Left switch on / right off: Crunch Left switch off / right on: Lead Both switches on: High gain lead In the amp's manual says: With this solution (Z4 footswitch), you can't activate the channels Crunch and Heavy Lead directly, i.e. this requires an intermediate switching operation. Isn´t it wrong for the Crunch?