Delay Types Explained: Tape, Analog, Digital, Ping-Pong, Slapback

What are the main types of delay?

Delay types split into two groups. Tape, analog and digital describe how the echo is stored, which sets its tone. Slapback, ping-pong and multi-tap describe the pattern of the repeats, and you can build any of them on any engine.

That distinction saves a lot of confusion when you pick a plugin: a "tape" mode tells you how the repeats will sound, while a ping-pong switch tells you where they will go. If time, feedback and mix are new to you, start with what delay is, then come back for the differences.

Tape delay: why do the repeats wobble and darken?

Tape delay records the signal onto a loop of tape and plays it back from a head further along, so the gap between heads and the tape speed set the delay time. Each pass through the tape adds a little saturation, loses a little top end and picks up speed wobble, which is why the repeats sound softer and more alive than a clean copy.

The Roland RE-201 Space Echo is the reference unit. BOSS says Roland introduced it in 1974 with a much longer tape loop than earlier designs, one record head, three playback heads and a variable speed motor; users set the delay time by changing tape speed with the Repeat Rate knob.^[1]

Plugins imitate those quirks with modulation and saturation. Ableton's Echo has a Wobble control that adds irregular delay-time modulation to simulate tape, and a Noise control that simulates vintage equipment.^[2] Image-Line notes in its Fruity Delay 3 manual that an analog or tape unit would naturally saturate at high feedback values, so subtle saturation settings get a similar effect.^[3]

Analog delay: what makes BBD repeats warm?

Analog delay pedals use a bucket-brigade device (BBD), a chip that passes the signal step by step through a chain of capacitors. Roland explains that the chip adds noise and clock artifacts that must be filtered out, which leaves the delayed signal darker than the input.^[6]

BOSS describes its DM-2 analog delay as having a warm and enveloping tone that came from intentional frequency limitations, and its later DM-3 as a touch less gritty and more refined.^[4] That limited bandwidth is a mixing advantage: dark repeats stay out of the way of the dry vocal or lead, so you can run the delay louder before it clutters the mix.

Push the feedback on an analog-style delay and the repeats get murkier and more distorted with every pass, which is the classic self-oscillating dub sweep when you twist the time knob. BBD chips also limit time: the original BOSS DM-2 offered a delay range of just 20-300 ms.^[6]

Digital delay: when do you want clean repeats?

Digital delay stores the audio in memory and plays back an exact copy, so every repeat sounds like the original. Use it when the echo is part of the rhythm and needs to stay tight and bright.

BOSS calls its DD-2 of 1983 the world's first digital delay in stompbox form, with a maximum delay of 800 ms.^[4] Modern plugins go much further: Ableton's Delay device, set to Time mode, runs from 1 ms up to 5 seconds.^[2]

The catch is that clean repeats compete with the dry signal. On a vocal, a bright digital echo at the same tone as the voice smears the words. Filter the repeats or duck them, which the section on feedback and filtering below covers. For tempo-synced times, the sibling BPM to milliseconds chart lists every common note value.

What is slapback delay, and what time should you use?

Slapback is a single, quick echo with little or no feedback, set long enough to hear as a distinct repeat but short enough to thicken the sound rather than trail behind it. Around 80-150 ms is the usual starting range.

The sound comes from 1950s Memphis. Sam Phillips told Sound on Sound that he was the first to use slapback at Sun Records by feeding the tape back through the board, bouncing the signal between two Ampex 350 tape machines with a split-second delay between them.^[5]

In modern production slapback does two jobs. On rap and trap vocals, a quiet slap at 60-120 ms thickens the voice and adds attitude without the wash of reverb. On guitars and snares, a slightly louder slap gives the rockabilly and indie sound. Keep feedback at 0-10% so you get one clear repeat, and low-pass the echo around 3-5 kHz for a vintage feel.

Ping-pong and multi-tap delay: moving echoes around

Ping-pong delay sends each repeat to the opposite side of the stereo field, and multi-tap delay plays several echoes at different times from one input. Both are about placement and rhythm rather than tone.

In Ableton's Delay, the Ping Pong toggle makes the delay signal move back and forth between the left and right channels.^[2] FL Studio's Fruity Delay 3 describes the same idea as flipping the left and right channels on each delay loop.^[3] Ping-pong keeps echoes out of the center, where the lead vocal lives, which is why it works so well on hooks and ad-libs.

Multi-tap goes back to tape machines with several playback heads. On the RE-201, selecting more than one head created multi-tap echo patterns.^[1] In a plugin, set taps to different note values, such as a 1/8, a dotted 1/8 and a 1/4, and pan them apart to turn one percussion hit into a groove.

How do feedback and filtering change any delay?

Feedback sets how many repeats you hear, and a filter in the feedback path sets how each repeat changes. Put the filter inside the loop and every echo gets darker or thinner than the one before, which is how hardware units naturally behaved.

Image-Line's manual explains that because the Fruity Delay 3 filter sits in the feedback loop, each echo is further filtered.^[3] Ableton's Delay places a band-pass filter before the delay signal, and its Echo has a Ducking option that reduces the wet signal while input is present.^[2]

• Feedback 0-10% One or two repeats. Slapback and tight rhythmic echoes.
• Feedback 20-40% Three to six audible repeats. The everyday vocal and lead setting.
• Feedback 50-70% Long trails for throws, breakdowns and ambient parts. Filter or duck them.
• Feedback near 100% Runaway self-oscillation on tape and analog models. Automate it for dub builds, then pull it back.
• Filter the repeats Start with a high-pass around 200-400 Hz and a low-pass around 3-6 kHz so echoes sit behind the dry sound.

How to set up a vocal delay throw

A delay throw sends only a chosen word or phrase to a delay, so the echo appears at the end of a line and then disappears. It is the most common way producers use delay on modern vocals.

1. Create a delay return
   Put a tape or digital delay 100% wet on a send track. Sync it to 1/4 or dotted 1/8 at the song tempo.
2. Set feedback for the gap
   Use 30-50% feedback so the echo fills the space before the next line, not the whole next bar.
3. Filter the return
   High-pass around 300 Hz and low-pass around 4-6 kHz so the throw sounds like part of the space, not a second vocalist.
4. Automate the send
   Keep the send off during the line and raise it only on the last word. On a hook, throw the final word of every second line.
5. Try ping-pong for width
   Switch the throw to ping-pong on ad-libs so the echoes bounce away from the center vocal.
6. Check the next line
   If the echo still ringing masks the first word of the next line, lower feedback or duck the return.

For detailed timing and automation on choruses, read delay throws for hooks; for an always-on vocal delay, see how to use send delay on vocals. Free engines for every type are compared in the best free delay VST plugins.