As of August 2026, Stacked Overdrive is retired.

DigiTech Quad 4 · Stacked Overdrive

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Quad 4

[ owner photo · DigiTech Quad 4 ]

A rack-mount four-engine digital effects processor from DigiTech.

[ owner photo · DigiTech Quad 4 ]

A rack-mount four-engine digital effects processor from DigiTech.

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