Guides

Best Slow & Reverb Extension Settings for Study, Sleep and Focus

2026-10-11

Starting-point settings for the Slow & Reverb Chrome extension, with tables for studying, sleeping, reading and workouts, and the reasoning about tempo and reverb behind each one.

People install the Slow & Reverb for YouTube extension for one of a handful of reasons, and almost none of them are about producing music. They want something to study to, something to fall asleep to, something that keeps a long reading session going, or something that pushes them through a run. Each of those wants a different sound, and the sliders that get you there follow a logic you can learn once and reuse.

This guide gives a table of starting settings for each situation and, more usefully, explains why. The numbers are not magic. They are places to begin, chosen because they tend to work on compressed streaming audio across a wide range of material. Your headphones, your room and your taste will move them. If you are new to the extension, read the listening guide first so the control names make sense, and the YouTube reverb extension page if you want more on what reverb does to a stream. For how reverb mix and decay interact in general, the reverb control page covers the theory.

The two levers that matter most

Every setting below is built around two decisions.

How far to slow. Speed changes two things at once: tempo and, by default, pitch. The tempo drop is what makes music feel calmer. The pitch drop is what makes it feel warmer and heavier. Around 0.85x you lose roughly three semitones. Around 0.90x you lose about two, and most people cannot say the song has been altered, only that it feels different. Around 0.80x the alteration is obvious. For background listening, the less obvious end is usually right, because an obviously processed song pulls attention.

How much room to add. Reverb pushes the sound away from you. A dry mix sits in front of your face and demands to be heard. A wet mix sits across the room and lets you work. The trick is that reverb also smears detail, so there is a point past which the music becomes a wash. Where that point is depends on how dense the music is. Sparse music tolerates a lot. Busy music tolerates little.

Bass, tone and width are seasoning. Bass adds physical weight, which helps on headphones and hurts on laptop speakers. Negative tone darkens the top end, which reduces the fatigue of long sessions. Width makes the room feel bigger on headphones and does nothing useful on a single speaker.

Studying and deep work

The goal is music you stop noticing. You want it present enough to mask the room and absent enough that you never catch yourself listening to the lyrics.

The reasoning: vocal music gets slowed less and gets less reverb, because a slowed vocal is interesting and interesting is the enemy here. Instrumental music can take more of both. Classical is barely touched, because it already has dynamics and its own hall; a long Space at a low mix adds a little distance without stacking a second room on the first.

A moderate reverb is doing most of the work in this table. It pushes transients back so the beat stops poking at you. If you find a particular playlist still grabbing your attention, lower Speed a notch before raising Reverb. Slowing takes the urgency out; more reverb only blurs.

Falling asleep

Now you want the opposite of alertness. The high frequencies that keep the brain awake go first, the room gets large, and the tempo drops further than you would use in daytime.

The Tone value is the one to notice. Pulling the high shelf down by six or seven decibels is far more than you would use for ordinary listening, and it is the setting that makes sleep playlists work. Cymbals, consonants and hi-hats stop registering. Combined with a long Space, the music turns into a texture with no edges.

Ballads are slowed less than ambient material because they are already slow, and a 65 BPM ballad at 0.80x drags in a way that is more distracting than soothing. Nature and noise videos get the lightest treatment: a little reverb to soften the recording, a dark tone, and not much else. Slowing rain does not make it more like rain.

Two practical notes. First, set a sleep timer in your operating system, not in YouTube. Autoplay keeps the effect running through whatever comes next, which is the point while you are awake and a problem at 3 a.m. Second, if you sleep with one earbud in, set Width to 1.0, because a wide image summed to one ear can sound hollow.

Reading

Reading sits between study and sleep. You need to stay alert enough to follow a paragraph but relaxed enough to sink into it, and you are more sensitive to lyrics than in any other situation, because words in your ears compete with words on the page.

The third column is a trick worth knowing. Vocals in a language you do not understand behave like an instrument; there is nothing for your reading brain to latch onto. They can be slowed a little more and given more reverb, and they often make the best reading music of all. Vocals you do understand get the lightest touch, with a short Space so the tail does not wash over the next line.

If you read on a laptop with the speakers, drop Bass to 0 across the board. Laptop speakers exaggerate the low shelf once reverb thickens the mids, and a boomy soundtrack is tiring over a chapter.

Workouts, sped up

The extension is not only for slowing down. Raise speed above 1.00x and the tempo climbs, the pitch rises with it, and a mid-tempo song turns into something you can run to. This is the same idea behind the sped up and nightcore styles, applied live to whatever playlist you have on.

Here reverb is kept low on purpose. Reverb adds distance, and for a workout you want the opposite: the music close and sharp. A short Space with a small mix adds a little excitement to a dry mix without softening the beat. Positive Tone brightens the top, which reads as energy. Bass stays up because the kick is what you move to.

On speed: 1.15x raises pitch by a little over two semitones, which most songs survive without sounding like a cartoon. Past about 1.25x vocals thin out and the effect becomes a style of its own. If that style is what you want, the sped up guide and the nightcore maker in the web editor are built for it. For a workout, a modest lift is usually more useful than a dramatic one, because you are matching your stride, not making a remix.

Cool-down goes back to 1.00x with a bit of reverb, so the same playlist eases you out without a jarring change in key.

Adjusting from the starting points

The tables are opinions. Here is how to move off them with a reason rather than at random.

• You keep hearing the lyrics when you did not want to. Lower Speed first by 0.02x, then lower Reverb. Slowing takes urgency away; reverb only blurs, and blur is still noticeable.
• It sounds like the song is underwater. Reverb is too high for the density of the music. Lower it until the words come back, then lower Tone by a decibel or two if the top end feels harsh afterwards.
• It sounds boomy. Bass is too high for your speakers. Laptops and small Bluetooth speakers want Bass at 0 to +2 dB regardless of what the table says.
• It feels flat and close. Raise Space before Reverb. A longer tail at the same mix adds distance without wetness.
• The beat has lost its point. Speed is too low or Reverb is too high, or both. Raise Speed to 0.90x and check again.
• Different songs in the same playlist feel wrong at the same setting. This is the one thing the extension cannot fix for you. It applies one setting to everything that plays. Choose playlists with a consistent tempo, or save a second preset and switch when the mood changes.

Save a preset for each situation once you have found your version. The extension stores presets locally, so the sleep preset is there tomorrow night without you rebuilding it, and switching between study and sleep is a single click. The YouTube Music guide walks through a four-preset setup.

Why these numbers sit lighter than upload settings

If you have read settings guides for making slowed and reverb uploads, the values above may look timid. Upload settings commonly run 40 to 50 percent reverb and +6 dB bass or more. There are two reasons the live settings sit lower.

First, streaming audio from YouTube is already compressed. The encoder has removed the quietest high-frequency detail, so the top end is a little duller to begin with and a few decibels of negative Tone go further than they would on a clean file.

Second, upload settings are chosen to make a three-minute edit sound dramatic. Session settings are chosen to be tolerable for three hours. What sounds great for one chorus becomes fatiguing by the fiftieth. If you only ever listen for a song or two, push the numbers up. For anything longer, start low.

The best speed guide covers the production side of the speed question if you want the detailed argument.

Open the free editor: upload MP3, WAV, AAC, OGG or FLAC, adjust speed, reverb, bass, tone, width and space, then export MP3 or a ZIP of many tracks. Everything runs in your browser.