How to: Stems (Drums / Bass / Melody / Vocals transitions)

Stems split the outgoing track into four separated parts so you can transition each one independently — e.g. swap the bass, crossfade the vocals, keep the drums.

Where to find it: Stems live in the transition editor's Stems tab, not as a timeline lane.

Open a transition window, then click the Stems tab.

Steps

1. Click a transition window to open the editor.
2. Click the Stems category tab.
3. Click 🎚 Separate stems. The outgoing track is split by an AI model (htdemucs). This takes

~1–3 minutes the first time and is cached — instant next time.

1. When it finishes, four dropdowns appear: Drums · Bass · Melody · Vocals. For each, choose:

• Full — the stem stays present through the blend
• Crossfade — the stem fades out over the transition
• Swap — the stem hard-swaps out (incoming takes over)
• None — the stem is removed during the blend

1. It applies live and bakes into Export.

Example moves

• Vocal ride: Vocals = Crossfade, everything else = Full → the outgoing vocal fades under the

incoming track cleanly.

• Bass swap by stem: Bass = Swap → the outgoing bassline drops out exactly on the switch while the

incoming bass takes over (tighter than an EQ bass-swap).

• Acapella-out: Drums/Bass/Melody = None, Vocals = Full → strip everything but the vocal on the way

out.

Notes

• v1 splits the outgoing track; the incoming plays full (so its own vocals/bass are already there).
• Stem choices are saved per track-pair and survive reload and Harmonize.