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Slow down, speed up, and add reverb to local audio
Slowed + Reverb is a Raycast extension for making slowed, reverb, and nightcore edits on macOS and Windows. Use it to process a batch, change tempo while keeping the original pitch, or convert files to MP3, WAV, or FLAC. SoX processes the audio locally and saves new copies beside the originals or in a folder you choose.
macOS
brew install sox
Windows
winget install --id ChrisBagwell.SoX -e
Restart Raycast after installing SoX. The extension checks your PATH and common install locations, including the WinGet links directory. If it can't find SoX, set SoX Executable Path in the extension preferences to the full path to sox or sox.exe. You can also install SoX directly. SoX downloads
Open Process Audio, pick one or more files, and choose a preset and output format. Leave Output Folder empty to save each result beside its source. The results list shows what was saved, where it went, and any files SoX could not read or process. Open a result, reveal it in Finder or File Explorer, or copy its path.
| Preset | What it does |
|---|---|
| Slowed + Reverb | Lowers speed and pitch and adds reverb. Defaults to 0.8× speed and 50% reverberance. |
| Slowed | Lowers speed and pitch. Defaults to 0.8×. |
| Reverb | Adds room sound at the original speed. Defaults to 50% reverberance. |
| Nightcore | Raises speed and pitch. Defaults to 1.2×. |
| Tempo (Keep Pitch) | Changes speed while keeping the original pitch. |
| Format Only | Saves the audio in a different format without applying effects. |
Use a speed from 0.5× to 2×. Where reverb is available, set its amount from 0% to 100%.
The four Generate commands run their presets directly on the selected audio files in Finder on macOS. On Windows, or when there's no audio selected in Finder, they open the file picker with the preset selected. Set the default slowed speed, nightcore speed, and output format in Raycast's extension preferences.
Output filenames include the preset. If a name is already taken, the extension adds a number, such as demo-slowed-2.wav.
sox --help to see the formats in your SoX build.With Raycast Pro, mention @slowed-reverb in AI Chat and include the file's full path. Inspect Audio reads the format, duration, sample rate, and channel count. Render Audio shows the files and settings for confirmation before creating new copies. SoX processes the audio locally.
@slowed-reverb How long is /Users/me/Music/demo.wav, and what sample rate does it use?@slowed-reverb Slow /Users/me/Music/demo.wav to 80% speed, keep the pitch, and save it as FLAC.@slowed-reverb Add 65% reverb to C:\Music\demo.wav and save it as WAV.Turn any song into a Slowed version
Add Reverb to any song
Turn any song into a Slowed + Reverb version
Turn any song into a Nightcore version
Batch process audio with custom speed, reverb, and output format