Every drive pedal does the same basic job: it pushes your signal harder than the circuit can cleanly handle, and the tops of the waveform get squashed. That squashing is called clipping. How gently or brutally it happens is what separates the four members of the family.
| Type | Clipping | Sound | Reacts to picking and volume knob |
|---|---|---|---|
| Clean boost | None (or very little) | Louder, same tone | Fully: it only adds level |
| Overdrive | Soft | Warm, like a cranked tube amp | A lot: dig in for grit, play softly to clean up |
| Distortion | Hard | Thick, compressed, more sustain | Less: stays saturated at most volumes |
| Fuzz | Extreme, almost square wave | Buzzy, woolly, huge sustain | Surprisingly well with vintage designs, which clean up from the guitar volume |
Soft clipping rounds the waveform off gradually, so light playing stays fairly clean. Hard clipping flattens it abruptly, so even soft notes come out dirty and evenly loud.
The knobs
Most drives have three: Gain (or Drive) sets how much clipping, Tone sets the brightness, and Level sets the output volume. Start with Gain at 11 o'clock, Tone at noon, and Level so the pedal on is the same volume as bypass. Then adjust one knob at a time.
When to use each
- Clean boost: louder solos, or pushing an amp that is already on the edge.
- Overdrive: blues, classic rock, crunchy rhythm. The Ibanez Tube Screamer is the classic example.
- Distortion: hard rock and metal riffs, where you want tight, even saturation. Think ProCo RAT or Boss DS-1.
- Fuzz: 60s rock, garage, stoner and big sustaining leads. The Fuzz Face and Big Muff are the famous names.
Stacking two drives
Two drives in a row don't just add up; the first one feeds the second. A common approach: a low-gain overdrive set as your rhythm sound, then a second drive after it for solos. Or put a mild overdrive with low Gain and high Level in front of a distortion to tighten the low end. Keep total gain lower than you think: stacked drives get noisy and mushy fast.
Finally, try your guitar volume knob. Turn it down to 7 with an overdrive on and you often get a clean-ish sound back without touching a pedal.