I have GR4 and Duet 2 for the interface. Guitar plugged into Duet XLR combo jack, level set to "Instr". Guitar rig is set up and plays fine, but it is clipping at even low levels. I can set it up where it will not clip but the levels are now very low. Set unity gain in GR4 and "0" for the "Instr" input on the Duet 2 causes clipping. So I lower the input to GR4 and the sound is anemic. So I raise the input to unity in GR4 and lower the output in GR4 to -7. No clipping but low levels. Weird.