Hi lukethemore, which ENGL amp do you have? Most have a parallel effects loop, while some models offer serial or parallel. Assuming you’re using something like a Fireball, which features a parallel loop with a dry/wet balance knob, you must run the H90 in Kill Dry mode. I would also set the connections from your effects loop to your pedal to line level. Parallel loops require a little more work setting them up because the amp forces the dry signal to always be maintained outside of any effects processor. This will require you to go into the H90’s programs (after you switch to kill dry mode) and adjust levels appropriately for the right balance. Depending on where you set the amp’s balance control, you’ll have to adjust the Mix/Intensity controls in each program to taste. I would experiment with starting with the Balance control at 50% and adjusting the H90 Programs levels accordingly. On a per Program basis, you cannot change the amp’s balance control, but you can on the H90.