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This is a Keeley modified DD-3. It adds an effects loop and a three way switch to cut the treble in two different increments or switch back to the original tone. From Keeley:Additionally, we augment the DD-3 with a 3 Way switch offering two settings that better emulate the sound of analog delays, an “Analog Feel” switch — reducing the treble in the repeats, thus softening up the sound of the delayed signal to recreate the signal loss inherent in bucket brigade style and tape delays. The first setting offers a gentle roll off, the second a bit more, approaching the sound of tape delay but without the wow and flutter associated with the effect. The center position bypasses the EQ capacitors, returning the DD-3’s stock sound, producing full bandwidth repeats.

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