How to make a slowed and reverb version

How to use this workflow

1. Start with a short representative section

   Choose a passage with vocals, rhythm and a gap at the end. A shorter source makes it easier to compare settings before processing the full recording.

2. Choose the rate first

   Open Slowed + Reverb. Try Slowed Only to hear the rate change by itself, then adjust the rate. This tool links pitch to speed; 85% is its slowed preset starting point.

3. Add reverb and export

   Enable reverb, choose a room and adjust decay and mix. Generate the effect, listen through the tail and download WAV or MP3 once the result works.

Make the pitch change an intentional choice

Slowing linked playback rate lowers the recording’s pitch. At 80%, a 440 Hz tone becomes 352 Hz and the source duration grows by a factor of 1.25 before reverb. This arithmetic explains the effect; it is not an included audio demo.

If you want slower music in its original key, use the independent speed control in the pitch changer instead. Add reverb afterward if needed. Those two workflows should not be described as identical.

Balance decay, pre-delay and wet mix

Decay sets how long the reflections persist; wet mix controls their contribution. Start with a low mix, listen through a lyric or chord change, and raise it only while the phrase remains clear.

Pre-delay separates the onset of the dry sound from the reverb. High cut darkens the reflection spectrum. The room choices are generated effect presets, not recordings of famous halls or analog hardware. Their names suggest a character rather than a measured venue.

Check the ending and the whole-file level

The generated file includes an effect tail, so it can last longer than source duration divided by rate. Listen past the final dry note. The renderer can lower gain when the combined effect would overload, so compare at similar listening levels.

Long slow versions need more processing memory. If the full file is rejected, shorten the input or reduce a long decay before retrying. Keep a WAV working copy when you plan more edits and make the MP3 delivery version after those edits are finished.

Calculate beat spacing before choosing the reverb tail

With linked playback rate, new BPM = source BPM × rate and dry duration = source duration ÷ rate. For a hypothetical steady 120 BPM recording lasting 60 seconds, 75% playback becomes 90 BPM and lasts 80 seconds before any reverb tail. One quarter-note beat then lasts 60 ÷ 90 = about 0.667 seconds. These are calculations under a steady-tempo assumption, not tempo analysis of an uploaded song.

The corresponding pitch change is 12 × log2(0.75), about −4.98 semitones. That is nearly five semitones down, not a same-key slowdown. Use the pitch changer’s independent Speed control when maintaining the original key matters. Reverb decay is selected in seconds; this tool does not automatically rescale it to a detected beat grid.

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Recheck the tail after changing playback rate

Choose Slowed Only to settle on the rate, then enable reverb and set its room, decay and mix. Listen to one transition where a lyric or chord changes. A tail that fills the gap at one rate can feel different after the notes move closer together or farther apart.

If you revise the rate later, revisit that transition and the final note before generating again. Keep the dry-duration calculation separate from the displayed estimated result, which can include the effect tail. An 80-second dry calculation does not require a reverberant export to stop at exactly 80 seconds. Save a name that includes the rate and room so you can reproduce the version you selected.

Keep the final reverb tail when preparing a timed delivery

Begin a timed delivery check with the dry source length, then inspect the effect ending separately. For an invented 40-second source at 80% linked rate, the dry material lasts approximately 50 seconds. A delivery slot of 52 seconds leaves only two seconds beyond that dry calculation. Selecting a three-second decay does not by itself establish that the complete exported file fits the slot: the renderer includes a tail, and the decay control is not a delivery-duration field.

Generate the effect and inspect the displayed estimate and the saved file duration. Listen past the last dry note to decide whether the tail is useful, too long or audibly cut off. Keep the chosen rate constant while trying a shorter decay or a lower mix so you can hear which change solves the ending problem. Reducing mix changes the contribution of the reflections; it is not a promise that the output ends sooner.

If the receiver needs an exact boundary, finish the approved render in an external editor and check the ending after any trim or fade. Confirm both the last lyric and the audible tail before accepting that delivery. Keep the untrimmed effect as your working copy. If you change the rate to fit more dry material into the slot, check pitch again because this workflow links rate and pitch. These are planning calculations and a checking procedure, not measured exports at the example settings.

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Common questions

Continue with your audio

• Open Slowed + Reverb →
• Work on reverb separately →
• Keep pitch while slowing down →
• Dry, Wet and Bypass: Read Effect Controls →