Fuzz pedal. With just a whiff of op-amp fuzz left after mutilating this muff, you're left with something that's dreamy in bass and gain range. What's needed for that rotten-to-the-core sound is a thick dose of bass, gain for days, and a perfectly scooped midrange that recalls the 1990's on speed dial. The GAIN of the Rotten Apple has an amazing range of gain on tap, AND it is sensitive to your guitar and strumming. So even though it pumps and smashes through your speaker cab, you can roll your guitar back to float like a butterfly. The Tone Control gives you everything from submerged stoner rock sludge to highs that claw at your speakers. But aren't V4s supposed to sound harsh?!? Well yeah, but Keeley rewrote every page of the book. The story doesn't end with rebuilding a circuit, it ends with the filtering. Why do certain sythns sound so amazing even though they are just generators? The filtering. Robert keeley nailed it. Fits perfectly in your 90s mix. Cuddle your guitar and this stompbox you little cherub and rock out.