Your AI voiceover and your AI music are both good on their own. The moment you layer them together, something sounds off. The fix is one extra step most people skip entirely: stems.

The real reason it sounds amateur

When you take a full AI-generated music track and layer a voiceover on top, you're stacking two complete audio worlds on top of each other. The music has its own melody, its own rhythm, its own frequency peaks — and so does the voice. They're both fighting for the same sonic real estate at the same time.

The result is a mix that sounds crowded and unintentional, even if each element is technically fine on its own. It's not a quality problem. It's a stacking problem.

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The fix: one extra step 🎚️

You don't need a different tool, a different voice, or a different track. You need to separate your music into stems before you mix.

1. Generate or pull your background track as normal. Use whatever AI music tool you're already using — this step doesn't change. Get the full track you want.
2. Run the track through a stem separator. Tools like Spleeter, LALAL.AI, or Moises take a full mixed track and pull it apart into separate components: vocals, bass, drums, melody, and instrumentation. This takes about 30 seconds.
3. Pull out the instrumental stem only. You want the version with no vocal, no lead melody competing for the same mid-range frequencies your voiceover lives in. That's the stem you'll use.
4. Layer your ElevenLabs narration on top of the instrumental stem. Now there's nothing fighting for space. The music supports the voice instead of competing with it.
5. Adjust the stem's volume level to sit under the voice. A rough starting point: instrumental stem at around −12 to −18 dB relative to your voiceover. The voice should be clearly heard without effort.

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What changes when you use stems

Same two AI tools. Same track. Same voice. The only difference is which version of the music you put underneath.

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Which stem separator, for which situation

You don't need anything expensive or complex. Here's a quick reference:

LALAL.AI	Clean browser-based tool, good for quick one-off separations. Free tier available with limited minutes per track.
Moises	Strong separation quality, works well on AI-generated music as well as recorded tracks. Good mobile app if you're working on the go.
Spleeter	Open-source, runs locally, no upload limits. Requires a little command-line comfort but handles batch jobs easily.
Adobe Audition	Has built-in stem separation if you're already in the Adobe ecosystem — no separate tool needed.

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The honest bit ✅

• Stem separation isn't perfect on every track. Some AI-generated music, especially heavily processed electronic styles, won't separate as cleanly as recorded music. Check the output before you commit to it.
• This doesn't replace gain staging. Even with the instrumental stem, if your voiceover and music are at similar volume levels, they'll still fight. The stem fix opens the frequency space — you still need to set the levels right.
• Not all tracks need this. A minimal ambient pad with no melody or vocals in it already behaves like a stem. If your music track is pure texture, this step may not be necessary.
• Free stem tools have upload limits. If you're doing this at any volume, a paid tier or a local tool like Spleeter will save you more time than you'd expect.