Here's a bit more explanation on the Helix amp parameters. I'd like to add this to helix help.com, but don't have a password to make edits. Can someone else make the updates?   Master   Adjusts the amount of power amp distortion: 0% clean 50% normal, 100% driven. Note that 50% may not be normal as the amps may have been modeled with the Master set too high. Consider using lower values, or the minimum distortion required to fit the song.   This parameter is highly interactive with all other pow