the envelope filter will distort with the range knob full turn. By now I'm sure you've noticed that the level and range knobs are extremely interactive. I like to turn the range knob up to the point just before it starts to distort and then use the level knob to find the "sweet spot". I'm sure you've notice that this pedal has a definite sweet spot...where it actually doesn't really work unless you set the two knobs just so. And it changes from guitar to guitar.
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*patience is a virtue*
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keith@buildyourownclone.com