by adjusting the feedback (often controlled manually from the pedal under names like "notch", "peak", "depth" and "crunch"), you achieved that the "mountains" (peaks) and "valleys" (phase-outs) that were already there, were made even more clear and audible.

This is all lower case. Can you fix that?
By adjusting the feedback (often controlled manually from the pedal under names like "notch", "peak", "depth" and "crunch"), you achieved that the "mountains" (peaks) and "valleys" (phase-outs) that were already there, were made even more clear and audible.