As of August 2026, Stacked Overdrive is retired.

DigiTech RP21D · Stacked Overdrive

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RP21D

[ owner photo · DigiTech RP21D ]

A multi-effects floor processor for guitar, sold in DigiTech's RP series.

[ owner photo · DigiTech RP21D ]

A multi-effects floor processor for guitar, sold in DigiTech's RP series.

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