From Analogman:

We have also come up with a switch that will make theDD-5 sound warmer and more like an analog delay, by rolling off the bright high end on the delayed signal. It is a 3 way switch- the middle position is stock, one way is a slight cut and the other way is a deeper cut. The switch looks just like the reverse mod switch. On the DD5 there may be a little clipping if you hit the pedal with hard, loud attacks. For slapback rockabilly playing, this mod is a MUST on these Boss pedals.

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