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Applying VST3 Effects

Curlo can load the VST3 audio effects installed on your Mac. Apply reverbs, modulators and other effects to a selected clip with instant preview in the waveform viewer — and they are applied automatically when you export, drag out, or insert into a DAW. Original audio files are never modified.

VST3 effect menu

Scanning VST3 Plug-ins

Curlo never scans automatically — scanning is fully user-triggered:

  1. Select an audio file and click the effect button next to the volume slider in the waveform viewer (it shows “No Effect” when nothing is selected).
  2. Choose Scan VST3 Plug-ins from the menu.
  3. Curlo scans /Library/Audio/Plug-Ins/VST3 and ~/Library/Audio/Plug-Ins/VST3 in a separate helper process, listing only usable effects — instruments such as synthesizers are skipped automatically.

Results are cached locally. After restarting or updating the app, the effect list is restored from the cache instantly; you only need to scan again when your plug-in folder changes.

If a plug-in is broken or hangs, the scan process is terminated automatically. Curlo itself is never affected, and any effects already found remain available.

Applying an Effect

  1. Drag on the waveform to select the region you want to process (with no selection, the whole audio is processed).
  2. Click the effect button and pick an effect from the VST3 Effects list.
  3. The effect’s native parameter panel opens automatically — the same UI you see in DAWs like Reaper. Changes take effect on the next preview playback.
  4. Press play to audition. The tail of the effect (e.g. reverb decay) plays out naturally after the selection ends.

Choose No Effect from the menu to turn effects off; switching to another audio file resets the selection and closes the panel automatically.

Preview & Export

Effects are only applied on output — the original file stays untouched:

  • Preview playback: the selected region (or the whole file) is rendered offline through the effect.
  • Drag out to a DAW: the generated WAV includes the effect (with its tail).
  • Bounce: right-click export to a folder or collection applies the effect as well.

Troubleshooting

  • My plug-in doesn’t show up? Make sure it is installed in one of the two standard folders above and is an effect (sub-categories starting with Fx). Instrument VST3s (synths, samplers) are not listed.
  • The panel opens blank or with the wrong size? Close it and re-select the effect. A few older plug-ins may not be compatible with embedded panels.
  • Mono audio with a stereo-only effect? No problem — Curlo converts channels automatically, similar to Reaper.