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Guitar Delay Types Guide: Analog, Tape & Digital
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About this reference
From the music-learning collection, adapted for Philojain Music Muse. Referenced sources remain credited in the article.
Delay is the most musical effect on a pedalboard because it plays in time with you, from a single rockabilly slap to cascading rhythmic patterns that turn one guitar into three.
The two questions that matter: what character of repeat do you want, and what time value serves the song. This guide answers both, with concrete settings.
Analog and Tape: Warm and Blurry
Older delay technologies degrade each repeat, and that flaw is the charm.
- Analog bucket-brigade circuits darken every repeat, so echoes tuck neatly behind your playing.
- Tape-style delay adds wobble and gentle saturation for a vintage haze.
- Both excel at thickening solos without cluttering them.
- High feedback settings self-oscillate into swelling noise, a classic transition trick.
Digital: Clean and Precise
Digital delay repeats exactly what you played, as long and as clearly as you like.
- Choose digital when repeats must stay intelligible, as in rhythmic pattern playing.
- Tap tempo and note subdivisions keep the effect locked to the song.
- Most modern digital pedals also model analog and tape voices convincingly.
- Trim the mix; pristine repeats feel louder than dark ones.
Three Classic Recipes
These three settings cover most of recorded music.
- Slapback: 80 to 140 ms, feedback 1 for a single repeat, mix 3 to 4. Rockabilly, country and indie vocals-style snap.
- Quarter note: 60000 divided by the BPM gives the time in ms; feedback 3 to 4, mix 2 to 3.
- Dotted eighth: quarter-note time multiplied by 0.75; feedback 3 to 4, mix 3 to 4 for chiming, interlocking lines.
Placement and Housekeeping
Where the delay sits decides how clean it sounds.
- Run delay after drive pedals, or in the amp effects loop with a driven amp.
- Delay before reverb, almost always.
- Use less mix live than at home; rooms blur repeats on their own.
- Practice tapping tempo mid-song; it matters more than any preset.
Frequently asked questions
How do I calculate dotted-eighth delay time?
Take 60000 divided by BPM for the quarter note, then multiply by 0.75. At 120 BPM that is 375 ms.
Should delay go in front of the amp or the loop?
Into a clean amp, the front is fine. Into a driven amp, use the loop so repeats stay clear.
Analog or digital for a first delay pedal?
A digital pedal with tap tempo and an analog-voiced mode gives you both characters in one box.
What is self-oscillation?
Feedback set so high that repeats regenerate endlessly, swelling into pitchable noise. Great for transitions; watch your volume.
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Time, mechanism by mechanism
Time (16)
Bucket-brigade delay (BBD)
An analogue shift register: charge stored on capacitor stages and clocked down the chain. Delay equals stages divided by two, divided by clock frequency. The MN3005 has 4,096 stages; the MN3007 has 1,024, giving 5.12–51.2 ms.
warm, imprecise repeats that are never quite identical to the note that caused them
Companding
A compander compresses before the delay line and expands after, so the line's own noise is pushed down by the same ratio the signal was lifted.
long analogue delays that are usable at all, instead of hissing louder than the guitar
Anti-clock filtering
Low-pass filters of 30–36 dB/octave with a corner near 3 kHz sit before and after the BBD to strip clock feedthrough — and every feedback pass goes through them again.
repeats that are already dark on the first one and get progressively darker until they dissolve
Tape echo
Head spacing divided by tape speed sets delay time. A Space Echo RE-201 has three playback heads in twelve combinations: head one 69–177 ms, head two 131–337 ms, head three 189–489 ms.
repeats that wobble in pitch, saturate and lose top end on every pass, in rhythmic patterns rather than single echoes
Self-oscillation
Feedback past unity gain and the loop runs away. Onset is program-dependent, not a fixed knob position.
the delay taking over and building into a howling, rising wall that has to be pulled back by hand
Echoplex preamp
A simple JFET gain stage that, with volume at maximum, gets only about 6 dB above unity. A tone conditioner rather than a boost pedal.
a modest lift and a midrange thickening that makes the amp behind it feel bigger than it is
Digital delay headroom
No anti-clock filter is needed, so repeats keep full bandwidth — but the ubiquitous PT2399 clips at about 3 V peak-to-peak and distorts above roughly 4 kHz, so “digital means more headroom” is a per-chip fact, not a category fact.
repeats that are exact copies, for better and for worse
Slapback
A single repeat at roughly 80–120 ms, used as a rhythmic thickener rather than as ambience.
a hard doubled attack on every note, tight and dry, with no wash at all
Dotted-eighth delay
Repeats land on the off-beats, so a simple arpeggio becomes a continuous sixteenth-note pattern. The part is written for the delay and does not work without it.
one guitarist sounding like two, with notes appearing between the ones being played
Spring reverb
A transducer at each end of a helical spring launches and recovers torsional waves. The spring is dispersive — different frequencies travel at different speeds — so a transient smears out by frequency rather than arriving together.
the drip: a metallic, splashy, unmistakably mechanical reverb that no algorithm reproduces
Dwell
A drive-level control feeding the tank's input transducer, not a decay-time control at all. Drive it harder and the springs themselves distort.
the reverb crashing and overloading rather than simply getting longer
Tank decay rating
Short tanks 1.2–2.0 s, medium 1.75–3.0 s, long 2.75–4.0 s; guitar amps typically use long. Multiple springs in parallel fill in each other's resonant dead spots.
denser and smoother with more springs, boingier and more resonant with fewer
Plate reverb (EMT 140)
A suspended sheet of steel about 2.4 by 1.2 m weighing around 270 kg, driven by a transducer, with decay set by a movable damping pad.
dense, bright, immediate reverb with no early reflections and no sense of a room
Algorithmic vs convolution
Algorithmic reverb synthesises decay from delay lines, comb and all-pass filters tuned to approximate a space. Convolution convolves the input against a recorded impulse response of an actual space.
algorithmic being tweakable and unreal; convolution being fixed and exactly like somewhere
Shimmer
A pitch shifter of +12 semitones, sometimes with a second voice at +24, placed inside the reverb's own feedback loop, so every pass rises again.
reverb that climbs upward into a choral, endlessly ascending wash
Reverse reverb
Reverb applied to a reversed signal, so the tail arrives before the note.
sound swelling backwards into each note, with the attack buried at the end instead of the start
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