Complete Slowed Reverb Guide: Settings, Presets & How to Make It Online

Slowed reverb is one of the few contemporary music styles whose entire technique fits in a sentence: play the song slower and put it in a room. There is no production skill barrier, no equipment, and nothing to learn that takes longer than an afternoon.

Which makes it interesting that most edits are not very good. The settings are simple; the reasons behind them are not, and almost every guide hands out numbers without them. This one is organised the other way round — what each control governs, why the ranges everyone uses turn out to have an actual explanation, and one settings table instead of six overlapping ones.

1. What It Is

A slowed reverb edit combines two operations. The track is slowed — typically to somewhere between 0.80x and 0.88x of its original speed — and reverb is added to place it in a larger acoustic space.

The slowdown is done with varispeed, which means the samples are read more slowly. That lowers every frequency in the recording by the same ratio, so the track does not merely get slower, it gets lower. The vocal deepens, the drums lose their snap, and the whole thing settles. This is the same physical operation as playing a record at the wrong speed, and it is what DJ Screw was doing with turntables in Houston in the early 1990s — the history of which is more specific and more Southern than the TikTok framing usually admits.

The reverb is what turns a slow song into an atmosphere. Slowing alone sounds like a slow song. Adding space is what produces the quality people are actually chasing: distant, enveloping, like the music is happening in a room you are not quite in.

2. Why 0.80x to 0.88x, Specifically

This range is repeated everywhere as though it were a matter of taste that happened to converge. It is not arbitrary, and the explanation is worth having because it tells you what happens when you leave the range.

Because varispeed scales every frequency, a speed setting is also a transposition, and the amount is exactly 12 × log₂(rate) semitones. Run the range through that:

• 0.88x — 2.2 semitones down, roughly a whole tone.
• 0.85x — 2.8 semitones down, roughly a minor third.
• 0.82x — 3.4 semitones down.
• 0.80x — 3.9 semitones down, roughly a major third.
• 0.75x — 5.0 semitones down, a full fourth.
• 0.50x — 12 semitones down, an entire octave.

2a. What Those Numbers Mean

The window everyone uses corresponds to a drop of about two to four semitones. That is a musically meaningful interval — enough to change the character of a voice noticeably — while staying inside the range where a voice still reads as a voice.

The reason there is a limit at all comes down to formants. A voice carries its note as a fundamental frequency, but it also carries resonances set by the fixed size of the singer's throat and mouth. Those resonances do not move when a singer changes note, which is how you can tell a soprano from a bass singing the same pitch. Varispeed cannot distinguish the two, so it moves the formants along with everything else — implying a vocal tract that changed size.

Small shifts read as warmth and depth. Past roughly 4 or 5 semitones down, the implied singer is too large to be a person, and the voice stops sounding deep and starts sounding processed. That is where 0.75x sits, and it is why the range stops where it does. Below it you are making a different, more abstract kind of edit — legitimate, but no longer the thing people mean by slowed reverb.

3. The Four Controls

Everything else is these four, and knowing which job each does prevents most bad edits.

Speed sets the emotional register and, as above, the key. It is the control that determines whether the edit is subtle or dramatic, and it should be set first because it moves everything else — your bass setting is aimed at frequencies that have relocated, and your reverb decay is being judged against a tempo that has changed.

Reverb wet mix is how much of what you hear is room rather than performance. At 30% you have a performance in a place; at 70% you have a place with a performance somewhere in it. This is the control people over-use, because reaching for atmosphere and turning up wet feels like it should work.

Decay is how long each reverb tail lasts, which sets how big the space feels. If you want a bigger room, this is the control — not wet. A long decay at a modest wet mix gives you a cathedral. A high wet mix at a short decay just gives you less vocal.

Bass compensates for what the slowdown moved. Slowing shifts low content further down, sometimes below what small speakers reproduce, so a few dB restores the weight. It is the most constrained control on the page because it is the one that can run you out of headroom.

4. The Pitch Trap

There is a fifth control, and the standard advice about it is wrong in a way that quietly undoes your work.

Every guide, including earlier versions of this one, recommends adding one or two semitones of pitch if a slowed vocal sounds too dark. On this tool — and on most browser tools, because they are built the same way — speed and pitch are applied to the same playback rate. They multiply rather than operating independently.

So adding +1 semitone to a 0.85x setting does not give you 0.85x with a brighter vocal. It gives you 0.90x, which is outside the range that made it a slowed edit. Add +2 and you are at 0.95x, which most listeners will not register as slowed at all. The advice to brighten with pitch walks your tempo out of the window, and because the change is gradual it feels like it worked.

The tool now displays the combined rate whenever pitch is not zero. But the cleaner answer is not to use pitch for this at all: if 0.82x sounds too dark, use 0.85x. You wanted slightly faster and slightly brighter, and speed delivers exactly that with one control instead of two working against each other. Every setting in the table below therefore uses zero pitch.

5. The Settings Table

One table, covering the cases people actually ask about. These are starting positions to be checked against your track, not targets — and the bass figure in particular depends on how much headroom your specific file has.

• All-purpose — 0.85x · 40% wet · 2.8s decay · +3 dB bass. The default if you have no strong opinion.
• Pop / vocal-forward — 0.85x · 35% wet · 2.5s decay · +2 dB bass. Wet kept down so the hook survives.
• R&B — 0.80x · 40% wet · 3.0s decay · +3 dB bass. Slower and wetter; the genre tolerates it.
• Rap / dense lyrics — 0.82x · 30% wet · 2.0s decay · +2 dB bass. Short decay is doing the work.
• Sad / emotional — 0.78x · 42% wet · 3.5s decay · +3 dB bass. The slowest here that keeps lyrics intelligible.
• Phonk / bass-forward — 0.86x · 25% wet · 2.0s decay · +5 dB bass. Reverb stays clear of the low end.
• Lo-fi / study — 0.88x · 35% wet · 2.5s decay · +3 dB bass. The gentlest slowdown; designed not to demand attention.
• Ambient / instrumental — 0.75x · 45% wet · 4.5s decay · +2 dB bass. No vocal to protect, so the constraints relax.
• Short-form video — 0.80x · 40% wet · 2.5s decay · +4 dB bass. Slightly exaggerated, since platform encoding flattens subtlety.

6. Matching Settings to the Source

The table gets you started; the source decides where you end up. Three properties of the original matter more than genre.

Density. A sparse track — solo piano, a vocal with light backing — has room for a long decay because there is space between events for tails to breathe. A dense mix does not, and the same decay that sounded spacious on the first track becomes mud on the second. If one note's tail has not meaningfully decayed before the next arrives, you are adding congestion rather than space.

Existing reverb. Recordings made in live rooms arrive with their own reverberation. Adding more puts a room inside a room, and it rarely sounds like either. Tracks that were recorded dry — most modern pop vocals — take reverb far better.

How loud it was mastered. This is the one people miss. A track pushed close to the ceiling has almost no headroom left, so it cannot absorb much bass boost before distorting, and reverb adds level too. If your edit crackles, the master was loud — not the reverb setting.

7. Bass and Headroom

Bass deserves separate treatment because it is where clean edits go wrong, and the usual framing is misleading.

Boosting is addition rather than redistribution. Whatever you add has to fit under the digital ceiling at 0 dBFS, and how much room exists is a property of your specific file. The gap between its current peak and the ceiling is its headroom, and that number — not the genre, not the slider position — is what determines whether a boost survives.

Measured on a signal peaking at −0.45 dBFS, a +6 dB low shelf produced a peak of +5.39 dBFS. There is no such thing as +5.39 dBFS in a finished file; everything above zero is removed on export, and the low end gets flattened into distortion. The same +6 dB on a track peaking at −12 dBFS is entirely comfortable.

So rather than copying a bass figure, measure. The volume booster reports peak, true peak, loudness, and remaining headroom before changing anything. Treat the headroom as a budget and spend it deliberately. The full arithmetic is here if you want it.

One further note specific to slowed edits: the bass boost on this site is a low shelf at 150 Hz, and slowing a track moves content downward across that corner. Material that sat above 150 Hz can descend below it and get caught by a shelf that previously missed it. Set the speed first, then judge the bass against the slowed version — a boost dialled in at full speed usually reads as too much once the track is slowed.

8. Making It on a Phone

The whole thing works on a phone, which is worth stating plainly because most tutorials assume a desktop.

Open the slowed reverb generator in Safari on iPhone or Chrome on Android. Tap the upload area and pick a file — on iPhone that means the Files app, on Android your storage or a cloud provider. Everything processes on the device rather than on a server, so there is no upload wait and no file size limit beyond what your phone can hold in memory.

Two mobile-specific notes. Longer tracks use more memory, so if a very long file struggles, trimming it first helps more than closing tabs. And judging bass on a phone speaker is unreliable — the driver physically cannot reproduce the range you are adjusting, so use headphones for that decision even if you do everything else on the handset.

9. Platform Reality

An edit that sounds right in your browser can arrive somewhere else sounding worse, and there are two reasons that are worth planning around.

The first is re-encoding. Every platform encodes what you upload, and if you exported a lossy file from a lossy source, that is already the third generation before the platform adds a fourth. Losses accumulate rather than overlapping, and they concentrate in exactly what a reverb tail is made of — quiet, complex, noise-like content. Export WAV whenever anything downstream will encode again; format details here.

The second is loudness normalisation. Essentially every streaming and social platform adjusts playback level toward a target, which means exporting as loud as possible achieves nothing except spending headroom you could have used. Published targets differ per service and change over time, so rather than chasing a number, leave margin below the ceiling and let the platform do what it will do regardless.

The practical consequence for reverb specifically: heavy wet mixes and long tails are what encoding damages first. An edit at 60% wet that sounded dramatic on export can arrive noticeably smeared. Moderate settings survive the trip better than extreme ones.

10. Questions People Actually Ask

Is slowing a song the same as slowed reverb? No. Slowing changes speed and pitch. Slowed reverb adds the acoustic space, and the space is what produces the atmosphere — a slowed track without reverb just sounds slow.

Why does mine sound muddy? Usually decay too long for the tempo rather than wet too high. Shorten the decay before reducing wet, or you will lose the atmosphere along with the mud. If it is specifically the low end that is unclear, it is the bass boost.

Why does it sound thin? The slowdown moved the low end down, possibly below what your playback reproduces. A small bass boost is the correct fix; this is exactly what it is for.

Why does it barely sound different? Check the combined rate. If you added pitch, you may have undone the slowdown without noticing.

Is it the same as nightcore? It is the mirror image. Nightcore speeds up and brightens; slowed reverb slows down and deepens. Mechanically they are the same operation in opposite directions — see the nightcore guide.

Can I post it commercially? The edit inherits the rights of the original recording and composition. Slowing a song does not create a new work you own. The copyright guide covers what is safe, risky, and off-limits by platform.

The Short Version

Slow to 0.80–0.88x, which is a two-to-four-semitone drop and the reason that range exists. Add 35–45% wet with a 2.5–3.5s decay, shortening the decay on dense tracks. Add a few dB of bass to replace the weight the slowdown relocated, after checking you have headroom for it. Leave pitch alone and use speed for brightness, because the two share one playback rate.

Set speed first, change one control at a time, and preview the chorus on headphones. Open the generator and try it on something you know well.

Method

The semitone figures are computed directly from the varispeed relationship, semitones = 12 × log₂(rate). The headroom demonstration was measured by rendering a 60 Hz tone at amplitude 0.95 through this site's own engine with a +6 dB low shelf and analysing the output: −0.45 dBFS before, +5.39 dBFS after. The 150 Hz shelf corner is read from the tool's source. The formant explanation is standard acoustics rather than a site-specific claim.

Earlier versions of this guide recommended adding pitch to brighten dark edits, and listed settings across several overlapping sections. The pitch advice was wrong for the reason given in section 4, and the duplicated tables have been consolidated into one.