Someone gave me a Boss Acoustic Simulator a few months ago. I never tried it and decided to try it in the loop. Never really messed with the FX loop. I plugged FX send to pedal input and pedal output to FX return. Using a blank patch with just FX Loop, I expected to be able to turn up output level 2 to hear the pedal but get no sound. Only dry guitar sound with output 1 level. What am I doing wrong?