Slow a finished bounce when you want the weight. Do not slow a mix that still has masking, phase, or a vocal sitting in the wrong chair.

After the mix, before the upload

Halftime is a listening decision. Kicks land later. Hats smear. A vocal that was proud can feel late. That is the point, and it is also why you do it on a bounce you already trust.

If you are still hunting a frequency, stay in the session. If you want the syrup version for a reel, a radio rip, or a late pass, drop the WAV on a local desk and export. HalfScrew keeps that on the machine: drag the song, scan the wave, take the slowed file.

Then the boring part

Duration doubled means a platform loudness number will not match the fast master. Re-measure. Crest usually opens a little. True peak is the one that surprises people.

Is this a mastering step?

No. It is a creative print. Master the version you will distribute.

Can I A/B the slow file?

Yes. Keep the original bounce and the export, then flip them in the analyzer preview.