guitar.services · signal chain reference
Eight guides to the guitar signal chain, pickup to power supply.
Jason Colapietro wrote these as an engineering reference for players: why pedals go in the order they do, what a cable does to your treble, where a buffer belongs, and how to get the hum out of a board. Each summary below gives the main point and the numbers behind it, then links to the full guide in Strumly’s guide library, where they live now.
Start with the map
The topology guide is the overview the others hang from.
Signal Chain · published May 26, 2026
Signal Chain Topology: What Actually Goes Where, and Why
Reduces any rig, analog, digital, or modeler, to five blocks: source, front of amp, preamp, effects loop, and power section and speaker. It sets out the front-of-amp order (buffer, tuner, wah or filter, compressor, drive, EQ), explains why a vintage germanium fuzz wants to see the pickup directly, and lists the usual mistakes: delay before overdrive, compression after gain, and reverb in front of the amp.
Read the full guide on Strumly: Signal Chain Topology: What Goes Where
Between the guitar and the first pedal
Three guides on the same physics: pickup impedance, cable capacitance, and where a buffer belongs.
Electronics · published May 24, 2026
Impedance and the First Three Feet
Explains why the unbuffered cable between the guitar and the first pedal is a common, cheap-to-fix source of lost tone. Instrument cables often sit around 30 to 80 pF per foot and premium low-capacitance cables around 12 to 25, and 20 feet of cheap cable presents roughly 600 pF. A buffer with a high input impedance and a low output impedance moves the rolloff out of the audio band. Its rule of thumb: under 10 feet of premium cable is fine without one; past 20 feet, buffer at both ends.
Read the full guide on Strumly: Impedance and the First Three Feet
Electronics · published February 1, 2026
Cable Capacitance and Frequency Response: The Spec That Actually Matters
Treats every guitar cable as a capacitor that forms a low-pass filter with the pickup’s source impedance. Its table runs 15 feet of cable into a 10 kΩ source: about 53 kHz cutoff at 20 pF per foot, about 21 kHz at 50, and about 10 kHz at 100. With a buffer at the start of the chain, capacitance stops mattering, so the money goes to durability and shielding instead.
Read the full guide on Strumly: Cable Capacitance and Frequency Response
Electronics · published May 15, 2026
True Bypass vs. Buffered: What Your Pedal Actually Does
Shows what each bypass type does with the pedal off: true bypass wires input to output, buffered bypass keeps an input buffer in the path. True bypass is fine for short runs under 15 feet with few pedals; once total cable passes 20 feet, one good buffer early in the chain restores the highs. The exception is vintage germanium fuzz, which goes first with nothing buffered ahead of it.
Read the full guide on Strumly: True Bypass vs. Buffered Pedals
On the board
Which pedal goes where, and how loud each one should hand the signal on.
Signal Chain · published January 15, 2026
Pedalboard Order: A Practical Methodology
Treats the standard order (dynamics, drive, modulation, time, amp) as a default and explains the reason behind each slot: compressor and wah before drive, modulation after it, delay and reverb last or in the loop. It covers the exceptions, including pitch shifters ahead of drive, three useful volume pedal positions, and stacking drives, and builds a board by starting with three pedals and adding one at a time.
Read the full guide on Strumly: Pedalboard Order: A Practical Methodology
Signal Chain · published May 22, 2026
Gain Staging Across the Chain
Keeps every block between its headroom ceiling and its noise floor. A boost at minimum is rarely at unity: three stacked boosts can hit the amp 6 to 12 dB hotter than the pickup, while six buffers or gates in series can lose 3 to 6 dB. Most tube preamp inputs start clipping around 100 to 200 mV peak. The guide gives a four-step procedure for setting unity across a board, one pedal at a time.
Read the full guide on Strumly: Gain Staging Across the Chain
Between the preamp and the power amp
Where time-based effects usually sound best, and how to wire them there.
Gain & Dynamics · published March 10, 2026
The Effects Loop: Serial, Parallel, and the Four-Cable Method
Explains the send and return between preamp and power amp, and why delay and reverb stay clearer there than in front of a driven amp. It compares serial loops, which put the pedal fully in the path, with parallel loops, which blend wet and dry on a mix control, then wires the four-cable method step by step and covers the mismatch between instrument-level (-10 dBV) and line-level (+4 dBu) gear.
Read the full guide on Strumly: Effects Loop: Serial vs. Parallel vs. Four-Cable
Powering the board
The noise floor under everything else.
Power · published April 20, 2026
Power Supply and Noise Floor: The Hidden Variable in Your Tone
Diagnoses noise by its sound: 60 Hz hum points to a ground loop, 120 Hz buzz to rectification artifacts, a high whine to digital pedals. It explains why daisy chains spread noise across a shared rail, what isolated outputs isolate, and which specs to check: current draw with 20 to 30 percent headroom, voltage, center-negative polarity, and regulation. Its recommendations scale from one to four analog pedals up to boards of eight or more.
Read the full guide on Strumly: Power Supply and Noise Floor for Guitar Tone
Put it on a board
Strumly’s Rig signal chain builder lets you lay out a pedalboard and watch power draw, noise risk, and gain-stack stats update as you go. More tools like it are on the practice tools page.
For the long version, Part VIII of The Signal Chain covers signal chain order, gain staging, and building the pedalboard, alongside the history of the amps and pedals the guides are about.