Audio Speed and Pitch Changer (Slowed + Reverb)

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how to make a slowed and reverb song

How to make a slowed + reverb version of a song

Open the tool, drop the song and tap Slowed + reverb. The preset already sets the speed to 0.85x, turns on the vinyl effect and adds the reverb. After that you just listen, adjust the mix and download.

What slowed + reverb does to a song

Slowed means playing the song slower in a way that the pitch also drops, like a record spinning below its speed. The math is fixed: a speed of 0.85x is 12 × log2(0.85), about −2.81 semitones. A track of 3 minutes and 20 seconds now lasts 3:55. The tool linked mode does exactly that, by sinc-filtered resampling, without stretching the audio, which is why the voice gets deeper and drawn out, the sound this style is after.
Reverb gives the feel of a large space. The tool generates an impulse response on the spot, using noise that decays exponentially, and applies it by convolution. The main parameter is RT60, the time for the tail to fall 60 dB: with 3 s the tail is 30 dB down at 1.5 s. Pre-delay (30 ms in the preset) separates the dry sound from the tail, and high-frequency damping makes the tail darker over time, as in real rooms. The 35% mix uses constant power, so overall loudness does not collapse.
You can refine without leaving the screen. Lower the mix to 20% if the music is dense, raise the decay to 4 to 5 s for ballads, turn on the muffled sound at 3.5 kHz for an other-room mood, or the bass boost at +4 dB to make up for what the pitch drop takes from the percussion. Use the Original and Changed switch to compare at the same position in the song. The reverb tail is added at the end, so the exported file runs a few seconds longer than the duration math above.

Checked values

Pitch drop at 0.85x

Input: 0,85×
Expected output: −2,81 st

12 × log2(0.85) = −2.8135 semitones.

New length at 0.85x

Input: 3:20 (200 s)
Expected output: 3:55 (235,3 s)

200 ÷ 0.85.

Slower, 0.75x

Input: 0,75×
Expected output: −4,98 st; 3:20 vira 4:27

Exaggerates the effect; works better on slow songs.

Tempo

Input: 120 BPM a 0,85×
Expected output: 102 BPM

Useful for matching another track.

Reverb tail with a 3 s RT60

Input: 1,5 s e 3 s
Expected output: −30 dB e −60 dB

Exponential fall: 20 dB per second.

Full tool FAQ

What is the difference between changing speed and changing pitch?

Speed (tempo) is how fast the music moves; pitch is how high or low it sounds. On a record or a basic player the two move together. Here you can change one without touching the other: 0.8x with the original pitch makes the song 25% longer without making it deeper, and +3 semitones at the same speed only makes it higher.

How do I make a slowed + reverb version?

What is nightcore and how much should I speed up?

Why does the pitch change when I only change the speed?

Does quality drop when I change the speed a lot?

What is 8D audio and does it work without headphones?

Can I see the new BPM of the song?

Which format should I export?

Is my file uploaded to a server?

How long does it take and what is the maximum size?

Frequently asked questions

Which speed is most used for slowed?

There is no technical standard. The preset uses 0.85x, with a drop of about 2.8 semitones, and you can try 0.8x to 0.9x to hear the difference. Below 0.75x the voice tends to lose clarity.

Can I slow it down without the pitch dropping?

Yes. Turn off the Pitch follows speed option and the tool uses WSOLA time-stretch. The result is a slow song at the original pitch, which is a different sound: without the deep tone typical of slowed.

Can I use the result anywhere?

The tool only alters the file in your browser and grants no rights over the music. Before publishing or distributing, check the license of the material and the rules of the place where you plan to use it.

Next steps

What slowed + reverb does to a song

Slowed means playing the song slower in a way that the pitch also drops, like a record spinning below its speed. The math is fixed: a speed of 0.85x is 12 × log2(0.85), about −2.81 semitones. A track of 3 minutes and 20 seconds now lasts 3:55. The tool linked mode does exactly that, by sinc-filtered resampling, without stretching the audio, which is why the voice gets deeper and drawn out, the sound this style is after.

Reverb gives the feel of a large space. The tool generates an impulse response on the spot, using noise that decays exponentially, and applies it by convolution. The main parameter is RT60, the time for the tail to fall 60 dB: with 3 s the tail is 30 dB down at 1.5 s. Pre-delay (30 ms in the preset) separates the dry sound from the tail, and high-frequency damping makes the tail darker over time, as in real rooms. The 35% mix uses constant power, so overall loudness does not collapse.

You can refine without leaving the screen. Lower the mix to 20% if the music is dense, raise the decay to 4 to 5 s for ballads, turn on the muffled sound at 3.5 kHz for an other-room mood, or the bass boost at +4 dB to make up for what the pitch drop takes from the percussion. Use the Original and Changed switch to compare at the same position in the song. The reverb tail is added at the end, so the exported file runs a few seconds longer than the duration math above.

Checked values

Pitch drop at 0.85x

Input: 0,85×
Expected output: −2,81 st

12 × log2(0.85) = −2.8135 semitones.

New length at 0.85x

Input: 3:20 (200 s)
Expected output: 3:55 (235,3 s)

200 ÷ 0.85.

Slower, 0.75x

Input: 0,75×
Expected output: −4,98 st; 3:20 vira 4:27

Exaggerates the effect; works better on slow songs.

Tempo

Input: 120 BPM a 0,85×
Expected output: 102 BPM

Useful for matching another track.

Reverb tail with a 3 s RT60

Input: 1,5 s e 3 s
Expected output: −30 dB e −60 dB

Exponential fall: 20 dB per second.

Full tool FAQ

What is the difference between changing speed and changing pitch?

How do I make a slowed + reverb version?

What is nightcore and how much should I speed up?

Why does the pitch change when I only change the speed?

Does quality drop when I change the speed a lot?

What is 8D audio and does it work without headphones?

Can I see the new BPM of the song?

Which format should I export?

Is my file uploaded to a server?

How long does it take and what is the maximum size?

Frequently asked questions

Which speed is most used for slowed?

There is no technical standard. The preset uses 0.85x, with a drop of about 2.8 semitones, and you can try 0.8x to 0.9x to hear the difference. Below 0.75x the voice tends to lose clarity.