The signal chain is the path from the guitar's pickups through cables and pedals to an amplifier, or to a modeler and speakers. Each effect changes the signal it receives, so the same pedals in a different order can sound quite different.
Pedal types
| Pedal | What it does | Typical place in the chain |
|---|---|---|
| Tuner | Shows the pitch; most mute the signal while tuning | First |
| Compressor | Evens out loud and quiet notes and adds sustain | Early, before drive |
| Wah | A filter swept with a rocking foot treadle, giving a vocal sound | Before drive |
| Fuzz | Extreme clipping into a thick, saturated tone | Drive section, often first among the drives |
| Overdrive | Mild, amp-like clipping that responds to picking strength | Drive section |
| Distortion | Harder, more compressed clipping | Drive section |
| Noise gate | Mutes the signal below a set level to stop hiss and hum | After drive |
| EQ | Boosts or cuts chosen frequency bands | Before or after drive, or in the effects loop |
| Chorus, phaser, flanger | Modulated copies or filters that make the sound move | After drive |
| Tremolo / vibrato | A rhythmic change in volume (tremolo) or pitch (vibrato) | After drive, often late |
| Delay | Repeats the signal as echoes | Near the end |
| Reverb | Simulates the reflections of a room, hall, plate or spring | Last |
Drive: overdrive, distortion and fuzz
All three add harmonics by clipping the signal, which means flattening the peaks of the waveform. They differ in how hard they clip.
- Overdrive uses soft clipping that rounds the peaks gradually. At low gain it thickens a clean amp, and it cleans up when the player picks lightly or turns down the guitar's volume. It is also used to push an already-driven amp harder.
- Distortion clips harder and adds more gain and compression. It gives a consistent, saturated sound for rock and metal rhythm parts and changes less with picking dynamics.
- Fuzz clips so hard that the waveform approaches a square wave. The result is thick, woolly or buzzy, with long sustain. Some vintage-style fuzz circuits react strongly to what comes before them and are usually placed close to the guitar, ahead of wah and buffered pedals.
A common order, and why
A conventional order is: tuner → compressor → wah → fuzz → overdrive or distortion → noise gate → EQ → modulation → delay → reverb.
- Tuner first, so it reads the guitar's unaltered signal and can mute everything after it.
- Compressor before drive, so it evens out the dynamics before they are saturated. Drive pedals already compress, so a compressor after them has less to do and raises the noise.
- Wah before drive, so the drive amplifies the sweeping filter. After the drive, a wah sounds sharper and more pronounced.
- Noise gate after the drives, where most of the noise is generated.
- Modulation and time effects after drive, so echoes and reverb tails stay distinct instead of being distorted into a smear.
- Delay before reverb, as in a real space, where echoes happen inside the room.
This order is a convention, not a rule. Reverb before a fuzz, or delay before a drive, gives distinct sounds that some players choose on purpose.
The amp's effects loop
Many amplifiers have an effects loop: send and return jacks between the preamp, where the amp's distortion is produced, and the power amp. Pedals placed in the loop sit after the amp's own distortion. When the amp provides the drive, modulation and time effects usually go in the loop so the echoes stay clean, while the tuner, compressor, wah and drive pedals stay in front of the amp. With a clean amp and all drive coming from pedals, the loop makes less difference.
A multi-effects unit with its own loop can be wired so that some effects sit before the amp's preamp and others in the amp's loop, a setup often called the four-cable method.
Modelers and multi-effects units
An amp modeler simulates amplifiers, speaker cabinets and microphones digitally, usually alongside a full set of effects. Many can feed a PA, an audio interface or headphones directly, with no amplifier, which suits recording and quiet practice. A multi-effects unit combines many effects in one box with stored presets; some include amp models and some are designed to feed a real amp. Either one lets a player try every pedal type, and change their order freely, before deciding which individual pedals are worth having.
Power and bypass
| Topic | What to know |
|---|---|
| Voltage and polarity | Most pedals run on 9 V DC with a center-negative plug; some need 12 V or 18 V. Check each pedal before connecting it. |
| Current | Each pedal lists its current draw in mA, and digital pedals often draw far more than analog ones. Each supply output must meet or exceed the draw. |
| Isolated outputs | A supply with isolated outputs gives each pedal its own circuit, which avoids ground loops and hum. Chaining many pedals from one adapter is simpler but more prone to noise, especially with digital pedals. |
| True bypass | When off, the pedal connects its input straight to its output. This is transparent in a short chain, but long cable runs add capacitance that dulls the treble. |
| Buffered bypass | When off, a buffer circuit drives the signal onward. A good buffer early in the chain preserves the treble across long cables and large boards. |
Building a first board
A first board needs three pedals:
- A tuner.
- One drive pedal. An overdrive is a flexible starting point: it works as a light crunch on a clean amp and as a boost on a driven one.
- A delay or a reverb. Many amps already have reverb, so a delay may be the more useful addition.
Add a suitable power supply, short patch cables and a board or flat surface. Learning what each pedal does across its settings, and how it interacts with the amp, comes before adding more pedals.
Getting advice
Pedal order, how much gain is enough and how a board works with a particular amp are the kind of practical questions students bring to lessons. The amp itself is covered in guitar and bass amps; rock and metal, grunge and punk and blues lessons put these tools to use.
Questions
Do guitar pedals need an isolated power supply?
A single pedal runs fine from its own adapter. With several pedals, especially digital ones, a supply with isolated outputs avoids ground loops and hum; each output must match the pedal's voltage, polarity and current draw.
