Dotted eighth delay for guitar: timing and playing patterns

A dotted eighth delay at 120 BPM is 375 ms. It waits three sixteenth notes before the first echo. When you pick steady eighth notes, that echo falls between later picked notes, creating a busier pattern than your hands are playing.

The effect depends on both the delay interval and the part you play. Start with a short, even picking pattern and a single clear repeat. A precise setting cannot make an uneven or overcrowded phrase automatically interlock.

Find the dotted eighth value

An eighth note is half a quarter-note beat. A dot adds half of the original note’s length, so a dotted eighth occupies three quarters of one beat:

Dotted eighth delay in ms = 60,000 / BPM × 0.75
                         = 45,000 / BPM

Song tempo	Quarter-note beat	Dotted eighth delay
90 BPM	666.667 ms	500 ms
100 BPM	600 ms	450 ms
120 BPM	500 ms	375 ms
140 BPM	428.571 ms	321.429 ms

Enter the song tempo in the BPM to MS calculator, then choose the Eighth note row and Dotted column. If the pedal accepts only whole milliseconds, use the nearest supported value. At 140 BPM, 321 ms is a practical rounded version of 321.429 ms; rounding does not change which subdivision you selected.

Hear where the first echoes land

At 120 BPM, each sixteenth-note step lasts 125 ms. Pick on 1 & 2 &, leaving the spaces between your eighth notes clear. With one repeat per pluck, the beginning looks like this:

Sixteenth count	1	e	&	a	2	e	&	a
Time from start	0 ms	125 ms	250 ms	375 ms	500 ms	625 ms	750 ms	875 ms
Picked note	Pick	—	Pick	—	Pick	—	Pick	—
First echo	—	—	—	Echo	—	Echo	—	Echo

The pluck at 0 ms returns at 375 ms. The pluck at 250 ms returns at 625 ms. Once the echoes have entered, picked notes and repeats fill alternating sixteenth-note positions. The beginning has a short gap because the delay needs time to receive the first note.

This table assumes a single delayed copy. More feedback creates second and later echoes, which add another layer to the pattern. First learn to hear the relationship with minimal feedback; otherwise it can be difficult to tell which note is coming from your hand and which is a repeat.

Set the pedal’s tap convention correctly

If the pedal has a dotted-eighth subdivision setting, select it and tap the quarter-note pulse at the song tempo, following the pedal’s manual. The pedal then applies the three-quarter-beat delay interval internally.

If a pedal simply makes its delay equal to the time between taps, quarter-note taps at 120 BPM give 500 ms, not 375 ms. You would need to tap the actual dotted-eighth interval or set the time control directly. For a known song tempo, entering 375 ms is usually easier than repeatedly tapping across the beat at that interval.

The website’s Tap Tempo tool measures the pulse you tap. Tap the song’s quarter notes there, then use the calculator’s dotted column. Tapping the dotted-eighth interval into the website and selecting dotted eighth again would apply the subdivision twice.

Practice a part that leaves room for the repeat

Begin with one muted note or a short two-note shape. Long ringing chords can hide the interlocking attacks while you are learning to hear them.

1. Set the calculated delay time and keep feedback at or near its minimum for one audible echo.
2. Set the delayed signal below the dry guitar, but loud enough to hear each repeat clearly.
3. Pick even eighth notes against a metronome. Let the delay supply the notes between your later plucks.
4. Stop picking and listen to the remaining echo. This makes the delay interval easier to identify.
5. Add a melodic pattern, then increase feedback only if the phrase has space for additional repeats.

If the effect sounds crowded, shorten the notes with your fretting or picking hand before increasing the wet level. If the repeats vanish under distortion, compare the delay’s position in your signal chain and its tone controls. Distortion applied after the delay processes both dry notes and echoes together, which can make their attacks less distinct.

Adjust for the performance

A fixed millisecond setting follows one constant tempo. If a band speeds up, the echo spacing stays the same unless someone updates the pedal or it follows a shared clock. Use a live tapping method that matches the pedal’s subdivision behavior rather than assuming the original setting will follow the drummer.

Dotted eighth is also different from swing. Its delay length is a fixed three-sixteenth interval; a swung performance can use a different placement for its short and long notes. The straight, dotted, and triplet guide explains that distinction. Choose the calculated value first, then judge the interlocking pattern against the way the part is actually played.