How to use it
- Drop a song on the page, or press it to choose a file. WAV, AIFF, FLAC, MP3 and M4A all work.
- Set the speed. 1.00 is the original; 0.85 plays 15% slower and about 2.8 semitones lower.
- Set the reverb amount and choose Hall, Plate or Room.
- Press Make it, then play the result. Change anything and press Apply changes.
- Download the WAV.
What slowed and reverb is
Slowed and reverb is a style of edit: a song played slower and lower, with a long wash of reverb, so it feels heavier, dreamier and more distant than the original. The slowing is what gives it the deeper voice and the lazy groove; the reverb is what makes it sound far away.
How the tool works
The song is decoded in your browser and played back slower, the way a turntable running slow lowers tempo and pitch together. The pitch drop in semitones is 12 times the base-2 logarithm of the speed, so 0.85 lowers it by about 2.8 semitones and 0.75 by about 5.
The reverb is a convolution with an impulse response: a recording of how a space answers a single click. We rendered those responses from Halo Reverb's Hall, Plate and Room spaces, fully wet, with a slightly darker high end so the tail stays soft. A convolution captures one snapshot of the reverb, so Halo's modulation, ducking and shimmer are not part of it.
The download is a 16-bit WAV with TPDF dither, scaled so its highest sample sits at -1 dBFS. The dither guide explains why that matters for quiet tails.
Settings that work
- Speed 0.80 to 0.90 is the usual range. Below about 0.75 voices start to sound unnatural.
- Reverb 25% to 45% keeps the song clear under the wash. Go higher for an ambient, far-away version.
- Hall is the classic long tail, Plate keeps vocals forward, and Room suits fast songs that would blur in a big space.
- To time the reverb to the new tempo in a DAW, multiply the original BPM by the speed and use the reverb calculator.
Questions
How do I make a song slowed and reverb?
Drop the song on the page, set the speed (0.85 is a common starting point) and the reverb amount, pick a space, then press Make it. Play the result, adjust if you like, and download it as a WAV.
Why does the pitch drop when I slow it down?
This tool slows the song the way a record slows when it spins slower: tempo and pitch drop together, which is the sound the slowed and reverb style is built on. At 0.85 speed the song plays 15% slower and about 2.8 semitones lower.
Where does the reverb come from?
From Halo Reverb, Vitric's reverb plugin. We rendered impulse responses of its Hall, Plate and Room spaces, and the page applies them to your song with convolution. An impulse response captures one snapshot of the reverb, so Halo's modulation, ducking and shimmer layer are not part of it.
Is my song uploaded anywhere?
No. The file is decoded, slowed and reverberated inside this browser tab. The only thing the page downloads is the reverb's impulse response, the first time you use each space.
What file do I get?
A 16-bit WAV at the song's sample rate, with TPDF dither, and peak-limited so its highest sample sits at -1 dBFS and never clips. WAV files are large: about 10 MB per minute of stereo audio.
Can I post slowed and reverb versions of other people's songs?
Use the tool on your own music, or on music you have permission to edit and share. A slowed and reverb edit of someone else's song is still their recording, and publishing it can break copyright.