Pedalboard Order and Why

Order, sag and the two resonances

Pedals — The Order Engine

A pedal is not an effect, it is a stage in a chain of nonlinearities — and its position determines what it actually does far more than its knobs do.

The order, and the electronic reason for each rule

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• The canonical source is R.G. Keen's "Effects Order," and it is a distortion-centric hierarchy rather than a pedal list: amplitude-altering effects first, then pre-distortion EQ, then distortion, then post-distortion EQ, then short time-based effects, then long ones, then reverb.
• Compressor before drive: evens out pick attack before the clipper, so the distortion works on a uniform waveform — smoother, more sustained. The cost is noise: the compressor's makeup gain lifts the noise floor, and the drive then amplifies and clips that too.
• Compressor after drive: distortion is already a brutal compressor — hard clipping pins the waveform at a fixed voltage — so a compressor downstream "adds minimal effect" dynamically. It becomes a sustain leveller and clean boost rather than a dynamics processor.
• Time-based effects after drive, and Keen gives the mechanism: phasers and delays create notches in the frequency response, and distortion placed after them "fill[s] in the response notches the time delay created." Put delay first and every repeat gets re-distorted — repeats become progressively muddy. Put delay last and it repeats an already-complete waveform, so the repeats stay distinct.
• Wah before drive is the clearest case in the whole guide. A wah is a swept bandpass; boosting one narrow band before a clipper means "the frequencies in the boosted range will be distorted most." That is literally frequency-selective clipping, and it also "cuts a lot of the harsh sounding intermodulation distortion" because the whole spectrum isn't hitting the clipper at once. Wah after drive just sweeps a filter over a spectrum whose harmonic content is already fixed — more predictable, less alive.
• Noise gates, and why serious rigs use two. A gate before the gain stage is largely useless on its own because "there's almost no noise to catch yet — the hiss and hum are mostly generated by the gain stage" downstream. A gate after the gain stage can act on the real noise, but distortion's compression means a sustaining note and the noise floor sit at nearly the same level, causing chatter. The documented two-gate solution: one gate reading the clean input for detection, a second placed after the gain block to do the muting — "detection and muting must happen on different signals for accurate tracking."
• And the disagreement is real, from named professionals. Bob Bradshaw puts distortion early, then filters and modulation. Pete Cornish puts the compressor absolutely first and warns a volume pedal before it "will defeat any compression." Dave Friedman calls order "a very subjective thing" and cites a working rig with wah last and delay first. Strymon's own guide says outright: "There is no wrong way to connect your effects." Treat the standard chain as a strong prior, not a law.

The Fuzz Face problem — the one circuit that genuinely hears what's in front of it

• Input impedance, simulated at component level: the first stage's rπ works out around 8 kΩ, but the feedback network drops it further — "in practice it will lower the input impedance to ~5 kΩ," varying between 5.2 kΩ and 8.4 kΩ with the Fuzz control's position. That is meaningfully lower than the ~10 kΩ figure usually quoted.
• It has no clipping diodes at all. Distortion is pure transistor saturation and cutoff. And it's deliberately mis-biased: the first transistor's collector sits near −1.6 V rather than the theoretically ideal −4.5 V on a 9 V supply, so small signals clip asymmetrically on one side first while larger signals push both half-cycles into saturation — "giving a nice touch sensitivity."
• Which is why a buffer in front kills it. ElectroSmash states it plainly: "the germanium transistor needs to see the inductance/impedance from the guitar pickups. If they see a buffer at the input, they tend to sound awful." The transistor's operating point is partly set by what's loading it; a buffer presents a fixed, engineered, low-impedance source the circuit was never voiced around.
• And it is why the guitar's volume knob cleans up a fuzz but not a Tube Screamer. The fuzz's input impedance is low enough to be comparable to the guitar's own volume pot resistance, so the pot isn't a clean attenuator — it interacts with the operating point. A Tube Screamer's input impedance is ~447 kΩ and a RAT's ~494 kΩ, which swamps that interaction entirely; and both have large fixed gain ahead of a fixed diode threshold (TS 12–118×, RAT up to 2305×), so even a heavily attenuated signal is still multiplied past the clipping point. Flag: the specific volume-pot-interaction chain is engineering inference from verified component values, not a single cited source.
• Important limit on the thesis, and it came from an expert pushing back rather than agreeing. A Fractal forum contributor noted that "just about any pedal that has a first gain stage that does not clip... acts as an input buffer that negates the source impedance effects." So impedance sensitivity is a property of a specific circuit category — direct-coupled transistor stages with no input buffering — not of pedals in general. Most op-amp drives genuinely do not care what's in front of them.

Clipping topologies — and where the simple rule breaks

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• Tube Screamer — soft clipping. Silicon diodes (~1 V forward voltage) sit inside the op-amp's feedback loop, so the stage's gain is actively reduced as the signal approaches the threshold. The waveform rounds rather than squaring. Input impedance ~447 kΩ, output ~1.2 kΩ, gain 12× to 118×.
• ProCo RAT — hard clipping. Diodes sit after the amplification stage, to ground rather than in the feedback path, so the LM308 swings toward its full gain — up to 2305×, 67 dB — before slamming into a fixed ceiling. Much squarer wave. Its tone control sweeps a low-pass from 475 Hz to 32 kHz. And the LM308's slew rate of 0.3 V/µs — about 40× slower than a TL071 — imposes a practical high-frequency ceiling near 5.3 kHz, which is itself part of the RAT's character.
• Big Muff — where the tidy rule fails. Its diodes are in the feedback loop of two cascaded transistor stages (~0.6 V each), which by the usual taxonomy makes it "soft clipping." It does not sound soft, because cascading two clipping stages matters as much as the topology of either one. Measured stage gains: 23 dB and 25 dB. Its tone stack produces a genuine notch centred at 1 kHz with about 6.5 dB of extra loss at the notch on top of ~7 dB overall stage loss, and the distortion bandwidth rolls off outside roughly 90 Hz–1.2 kHz at 60 dB/decade.
• Fuzz Face — no diodes. Clipping is the transistor's own operating point, which moves with signal amplitude and source impedance. No fixed threshold anywhere in the circuit.
• The Tube Screamer's two 720 Hz filters are worth stating precisely because they do opposite jobs. A high-pass at 720 Hz (R4 4.7 kΩ with C3) sits before the clipping so "harmonics above 720 Hz get the full gain of the distortion stage" — pre-emphasis, deciding what distorts. A separate passive low-pass at 723.4 Hz (R7 1 kΩ, C5 0.22 µF) in the output stage cuts highs after clipping. Same corner frequency, opposite side of the nonlinearity.

Compressors, and true bypass versus buffered

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• Ratio is arithmetic, not vibe: at 4:1, "for every 4 dB of signal that passes above threshold, the compressor allows only 1 dB through." Attack bands roughly as 0–1 ms fast (squashes the pick transient, adds perceived sustain), 1–10 ms moderate, 10–30 ms slow (lets the transient through, preserves snap). Release is what actually extends perceived sustain, by holding makeup gain into the note's decay.
• Three topologies, with real examples. OTA — MXR Dyna Comp / Ross, built on the CA3080, input impedance ~1 MΩ, timing set by C8 (10 µF) and R13 (150 kΩ). FET — Origin Effects Cali76, modelled on the studio 1176; "lightning fast... usually associated with the pumping kind of sound." Optical — an LDR whose physics does the work: "it can be turned on (gain reduced) quickly, but turns off relatively slowly. This has a natural musical property." The lag is the vintage character, not a design choice layered on top.
• True bypass versus buffered is a genuine trade, not a hierarchy. True bypass is a mechanical wire through, but a bare switch contact can pop audibly, especially into high gain. Buffered bypass removes the pop but puts active circuitry permanently in the path, and cheap implementations do degrade the signal.
• And the famous threshold is folklore. The commonly repeated "about 5 pedals before you need a buffer" comes with its own source immediately conceding "there's no magic number that fits all setups." There is no measured cliff — the real quantities are the pF/ft and pF/connector figures, and those depend entirely on your cable lengths.
• Where a buffer goes: early — right after the guitar, or after the first impedance-sensitive pedal if you want that one to see raw pickup impedance — and before any long run. And always when splitting to multiple destinations, because two amps or an amp plus a DI load each other in parallel without one.

2. FILTER FIRST, CLIP SECOND

Pedals ▸ Guitars — A guitar's tone knob can only subtract. Put that in front of a clipper and subtraction becomes selection.

The variable that moves: The passive tone control moves into the chain — as a decision about what distorts rather than what's heard.

Hinge (what already agrees): A wah is a guitar tone control made sweepable, and both are passive filters that can only remove. Neither has gain. The guitar's tone pot is a fixed low-pass with a variable corner; a wah is a bandpass with a swept centre. Same family, same limitation, same position in the chain.

Friction (what fights): But a modern board is built to be immune to exactly this. Buffered bypass, op-amp input stages, fixed impedances — every design decision on a contemporary pedalboard exists to make each box behave identically regardless of what surrounds it. That immunity is the direct opposite of the guitar's defining characteristic, and it means a filter dropped anywhere in a buffered chain simply filters, rather than interacting.

Resolution: Use position rather than impedance to get the interaction back. Put every filter before the clipping stage, and the passive subtraction becomes frequency-selective clipping: "the frequencies in the boosted range will be distorted most," while everything outside stays comparatively clean. That is the one place where a filter's effect is qualitative rather than merely tonal. And it has a second documented benefit — it "cuts a lot of the harsh sounding intermodulation distortion," because the whole spectrum isn't hitting the clipper simultaneously. Then put a second filter after the clipper for ordinary tone shaping, which is exactly what a Tube Screamer does internally: a high-pass at 720 Hz before the diodes, a low-pass at 723 Hz after them.

Recipe

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• Chassis: pedalboard, standard order, everything buffered except where specified
• Every filter before the drive: wah, EQ, any pre-emphasis. This is where they change what gets distorted
• The drive stage in the middle, with its gain set so the pre-filter's boosted band clips and the rest doesn't
• A second filter after the drive for conventional tone shaping — same corner frequency is fine, opposite job
• Compressor after the drive, not before, so it acts as a sustain leveller and doesn't lift the noise floor into the clipper
• Time-based effects last, so repeats stay articulate rather than being re-distorted into mush
• The audible test: sweeping the pre-filter should change the character of the distortion, not just its brightness. If it only changes brightness, it's in the wrong place
• Avoid: putting modulation or delay before the drive unless the muddied, notch-filled result is what you want.

3. FOUR CABLES

Amps ▸ Pedals — The amp is already a pedal chain. It just has the boxes soldered in a fixed order.

The variable that moves: Chain order moves into the amplifier — and discovers the amp has two clipping stages in different places.

Hinge (what already agrees): An amp is a chain of stages with the same logic as a board. Preamp gain, tone stack, phase inverter, power tubes, output transformer, speaker. And the passive tone stack sits between gain stages — so the amp is already doing merge 2 internally, filtering before one clipper and after another.

Friction (what fights): But the amp distorts in two places and only one of them is before the effects loop. A delay in front of the amp gets distorted by the preamp and the power amp; a delay in the loop is distorted only by the power amp. And that matters, because power-amp distortion "can smush reverb trails and delay repeats into a much less articulate, smeared-together howl." Meanwhile a noise gate placed at the input is nearly useless — "the hiss and hum are mostly generated by the gain stage" downstream of it.

Resolution: Four-cable method, and split the gate in two. Drives and filters go in front of the preamp, where they belong — pre-clip. Time-based and modulation effects go in the loop, after the preamp's gain, so their tails stay articulate. And the gate becomes two devices doing two jobs: one reading the clean input signal for detection, one after the gain block doing the muting, because "detection and muting must happen on different signals for accurate tracking." That's the documented two-gate approach, and it's why serious high-gain rigs carry two units that look redundant and aren't.

Recipe

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• Chassis: valve amp with a series effects loop, four-cable method
• In front of the preamp: filter, wah, drives, boost — everything whose job is to decide what gets clipped
• In the loop: delay, reverb, modulation — everything whose job is to process an already-shaped signal
• Gate one reads the clean guitar signal at the input, for detection only
• Gate two sits after the gain block and does the actual muting
• Set the loop level carefully: an 18 V pedal in a loop can clip a modeller's or a return stage's input — a real gain-staging issue, not folklore
• Test: a delay repeat should decay cleanly rather than fizzing or smearing. If it smears, it's in front of the preamp and should be in the loop
• Avoid: a single gate at the input on a high-gain rig. It is muting a signal that has no noise in it yet.

6. TWO RESONANCES, ONE CHAIN

Amps ▸ Guitars — Both ends of the chain are resonant systems. Almost nobody chooses them as a pair.

The variable that moves: The load's resonance moves back to meet the source's — and they turn out to be the same kind of problem.

Hinge (what already agrees): Neither end of the signal chain is flat, and both are resonant for the same reason: inductance and capacitance in a real physical device. A loaded pickup peaks somewhere between 2.0 and 5.0 kHz. A speaker peaks near 70 Ω at just above 100 Hz and climbs back to about 50 Ω by 20 kHz. Neither is a designer's choice — both are consequences of the physics.

Friction (what fights): But they're specified in different units and chosen independently. The pickup's resonance is an electrical peak in the signal; the speaker's is an impedance peak that the amp reacts against, plus a mechanical rolloff at 5 kHz where the cone stops keeping up. One is voltage, one is impedance, and nothing in guitar culture puts them on the same page — so people pair a bright pickup with a bright speaker and wonder why it's shrill.

Resolution: Choose them as a pair and put the pickup's peak inside the speaker's passband. A speaker rated to 5 kHz means a 3.0–5.0 kHz single-coil peak lands right at the edge of what will be reproduced — present and cutting, and above it the cabinet is removing everything anyway, which is why distortion through a real cab never sounds like distortion through a desk. A 2.0–2.5 kHz humbucker peak sits comfortably inside the passband and reads as thick and singing, and generally wants a brighter speaker to compensate. And the speaker's impedance peak at resonance is where the amp's damping is weakest and the low end gets loosest — so the same pairing decision sets the tightness of the bottom end too. One choice, both ends.

Recipe

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• Chassis: amp and cabinet chosen together with the guitar, not separately
• Bright pickup (3.0–5.0 kHz peak): pairs with a darker, earlier-breaking speaker, because the peak already sits at the edge of the passband
• Warm pickup (2.0–2.5 kHz peak): pairs with a brighter speaker, because the peak sits well inside it and needs help to cut
• Cable length is the fine adjustment — it moves the pickup's peak down by roughly 4 kHz across a long run, which is a bigger change than most tone controls
• The speaker's impedance peak near 100 Hz is where damping is weakest. Expect the low end to be loosest and most resonant there, and voice the amp's low end accordingly
• Nothing above 5 kHz survives, so stop trying to fix fizz with EQ — the cabinet already removed it, and if you can hear it you are listening to a direct signal
• Presence control has a hard ceiling equal to the amp's feedback depth, typically 6–10 dB. If it isn't enough, the fix is the speaker, not the knob
• Avoid: choosing pickup and speaker independently and correcting with EQ afterwards. You are EQ-ing two resonances that could have been chosen to complement each other.

Stereo pedalboard rigs — what actually works

Two things decide whether a stereo rig works: which effects are genuinely stereo, and whether the thing at the end accepts a line-level stereo input. The second one is where most rigs fail, and the marketing is not reliable about it.

• Only some effects are meaningfully stereo. Modulation (chorus, flanger, phaser — usually two LFO-driven paths offset in phase) and time-based effects (ping-pong and true-stereo delay, algorithmic reverb) genuinely produce different left and right signals. Distortion, compression and most gain stages are inherently mono processes even inside a box labelled stereo.
• "True stereo" and "ping-pong" are not the same thing and both get marketed as stereo. True stereo runs independent, decorrelated processing on each side; ping-pong takes one signal and bounces it between two outputs. Audibly different.
• Phase cancellation is the one real physical risk, and it has a documented worst case. Modulation effects deliberately produce out-of-phase left and right content — that's what creates the width. Summed to mono, "summing a stereo signal can sound like a reduction in the effect level," and a stereo tremolo running 180° out of phase "can completely erase the effect and sound like it's in bypass."
• Chase Bliss's Joel Korte states the room problem plainly: "unless one is in the sweet spot, the effect... may cancel out in the air." What sounds enormous in headphones can partially null in a room depending on where the listener stands and where the mics are.
• The two practical mitigations: keep modulation in mono before the split to stereo delay and reverb; and prefer a "split sum" (duplicate one channel to both outputs) over a naive L+R sum when collapsing, which avoids the cancellation entirely for modulation while a true sum stays fine for delay and reverb.
• Wet/dry/wet solves both problems at once. Dry signal to a centre amp for punch and mono reliability; effects split to two amps panned hard left and right. You keep a strong mono-compatible centre and still get the spatial content — and you stop the whole rig from depending on the audience standing in one spot.
• Two identical amps versus two deliberately different ones is a creative choice with no technical consensus. Korte's own wet/dry rig used mismatched amps — a high-headroom solid-state amp plus "a gnarly-little-homemade tube amp."