Drive is both a family of effects and a knob label. A linear Boost raises level; overdrive, distortion, fuzz, and saturation reshape a waveform nonlinearly. Rounded or clipped peaks can add harmonics and compress dynamics. Overdrive is often more responsive to picking, distortion often more dominant, and fuzz often more extreme. These boundaries are not absolute.
Sine-wave soft/hard clipping diagrams are learning tools, rather than proof of one fixed waveform shape for every pedal. Two pedals with similar curves can differ because of EQ, memory or dynamic behavior, and gain staging. Many overdrives can become heavily saturated, and some fuzz pedals clean up when the guitar volume is reduced. Tube Screamer belongs to the overdrive family.
Drive sets how hard the nonlinear process is driven; Tone shapes frequencies; Level sets the output. A higher Level can add distortion in the next stage. A gain position of 70% on different models does not imply equal distortion. Tone at 50% does not automatically mean flat EQ. Native overdrive/distortion provide Drive/Tone/Level without Blend, but that does not guarantee every pick is always distorted. Parallel paths or direct monitoring can still carry clean audio.
Fuzz Bias changes character and asymmetry, rather than simply bass or gain. Tape saturation adds harmonic distortion; it is not tape delay. A Bitcrusher reduces amplitude resolution and the update rate inside the effect, without changing the device sample rate. NAM Pedal uses a capture with Input/Output/Blend and calibration rules; Input trim is not the same as turning the original device's Drive knob.
Stacking processes a signal in sequence: boost → overdrive → distortion differs from the reverse order. EQ before clipping changes what drives the nonlinearity; EQ after it shapes the result. Many stages at maximum gain can reduce definition and increase noise. Strong distortion does not require output above 0 dBFS. Smooth means a more controlled texture; it does not have to mean clean or dark.
Concept references
- BOSS — Overdrive and Distortion
- BOSS — Getting the Most Out of Your Overdrive Pedal
- BOSS — Inside the FZ-1W Fuzz
- Ibanez — TS808 Tube Screamer
- iZotope — What is audio saturation?
Gain and nonlinear shapes
How do soft and hard clipping differ?
- Raw output Peak
- 0.964×
- Raw output RMS
- 0.802×
- RMS-match multiplier
- 1.000×
Soft clipping rounds the peaks gradually. A nonlinear shape adds harmonics; native pedal results are more complex.
A simple mathematical model, not an OD, Forge, or Velvet pedal model. RMS matching affects only the second waveform; the transfer curve and raw Peak numbers keep their original levels.