How to Revise Part of a Song with AI

Revise is Song Creator Pro's tool for regenerating a portion of a track without touching the rest. You upload a song, change the lyrics or description, and the model rewrites the targeted section while respecting the surrounding context, keeping the same key, tempo, feel, and timbre.

The model looks at the audio on either side of the target section and fills in the middle based on what musically makes sense.

This guide walks you through using Revise.

When to Use Revise

Revise is the right feature when:

• A verse or chorus didn't come out right, but the rest is great and you don't want to reroll the whole song
• You want to rewrite lyrics for a specific section: change just the second verse while the first verse and chorus stay untouched
• A transition feels awkward: regenerate the few seconds around the problem area
• You want to shift the mood of a section: make a verse more intense, a chorus more restrained, or a bridge more experimental

If you want to transform the whole song, use Remix instead. If you want to add entirely new instrument layers to a track, use Layer.

Step 1: Upload Source Audio

Click the Revise tab at the top of the interface. In the Source Audio field on the left, upload the track you want to edit.

This can be a song you've generated in Song Creator Pro (just click Revise directly on any previous result), a commercial song, a demo, or even a previous Revise result. MP3, WAV, FLAC, and M4A all work.

Once your audio is loaded, you'll see a waveform with two purple handles. Drag these handles to select the portion of the song you want to revise. The selected region (shown in purple) is what the model will regenerate. Everything outside the handles stays untouched. The time range is displayed in the top-right corner of the waveform (e.g. "2:05 – 2:26").

Step 2: (Optional) Upload Reference Audio

The Reference Audio field accepts an optional track whose timbre and style are blended into the revised section. Most of the time you should leave this blank. Revise usually works best when the revised portion matches the source's own timbre. It's useful when you want the revised portion to pick up a specific sound from another track.

Step 3: Edit the Lyrics

The most common thing to change with Revise is lyrics. In the Lyrics field, put the full lyrics of your source song, broken into sections with [Verse], [Chorus], and [Bridge] tags, then edit the portion you want changed.

Keep the overall structure matching your source. The model uses your lyrics to understand what section is being sung where; rearranging the structure too aggressively can confuse it. Edit words, not tags.

If you're not changing lyrics, paste your existing lyrics as-is. Revise still needs them for context.

Step 4: Adjust the Description (Optional)

If your revision isn't just a lyric tweak (say you want the revised section to feel more intense, more intimate, or more experimental), update the Description field to reflect that direction.

Leaving the description alone tells the model "keep making the same kind of music." Changing it says "lean this way in the revised region."

Step 5: Choose a Revise Mode

The Revise Mode dropdown selects a preset that controls how the model approaches the revision. There are three options:

• Conservative: preserves most of the source audio around the revised region. Best for subtle fixes where you want to keep things close to the original.
• Balanced (default): blends between preservation and regeneration. The degree of change is controlled by Revise Strength. Works well for most cases.
• Aggressive: fully regenerates the selected region with no source preservation. Use this when you want the section to be completely rewritten.

Start with Balanced. Switch to Conservative if your edits are changing too much, or Aggressive if the original is bleeding through too heavily.

Step 6: Set Revise Strength

Revise Strength (0.00 – 1.00) controls how much the revised section diverges from the source.

• Low (0.1 – 0.3): subtle tweaks. The melody and phrasing stay close to the original. Good for small corrections or gentle variations.
• Mid (0.4 – 0.6): noticeable rewrite. New lyrics actually sound rewritten rather than timidly edited. Default is 0.50.
• High (0.7 – 1.0): dramatic rewrite. The model takes significant liberty with the section. Good when you want a portion to feel genuinely different.

For lyric changes where the new words scan similarly to the original, the 0.4 – 0.6 range is the sweet spot. For bigger conceptual shifts ("turn this soft verse into an aggressive one"), go higher.

Step 7: Blending Settings

These three settings control how the revised section fits into the rest of the song. The defaults work well for most edits, but they're worth adjusting if you hear artifacts at the edges of your selection.

• Latent Crossfade: how much the revised section blends into the surrounding audio during generation. Higher values make for smoother transitions but can soften the edit. For reference, 10 frames is about 0.4 seconds. Keep it low for precise changes, raise it if the edges sound abrupt.
• Waveform Crossfade: a short fade applied where the new audio meets the old audio. This prevents pops or clicks at the boundary. 0 means a hard cut, and small values (0.02–0.1s) are usually all you need.
• Mask Mode: controls whether the model is allowed to touch audio outside your selected range. Auto lets the model blend naturally beyond the edges for smoother results. Explicit locks the changes strictly within the range you selected.

If your edit sounds good but the transition into the rest of the song is jarring, try increasing Latent Crossfade or switching Mask Mode to Auto. If the edit is bleeding outside your selection more than you want, switch to Explicit and lower the crossfade values.

Step 8: Generate

Hit Generate in the top right. Revise runs faster than a full generation since only part of the track is being regenerated.

Batch generate. Set batch size to 2–3 and pick the version that blends in most naturally. Revise results vary from run to run, and the best one is rarely the first.

Tips

• Several light passes beat one heavy-handed pass. Running Revise twice at a low Revise Strength often blends better than running it once at a high strength.
• Match lyric length to timing. If the original verse fit 8 lines into 20 seconds, your rewrite should fit roughly 8 lines into 20 seconds. Mismatched syllable counts confuse the alignment.
• Save snapshots as you iterate. It's easy to Revise yourself away from a good result. Hit Save whenever you hit a version you like.
• Clean source = clean Revise. If your source has heavy artifacts, Revise will have trouble blending a clean edit into it.

Related Guides

• Remix: reinterpret a whole track in a new style
• Extract: pull individual stems out of a song
• Layer: add new instruments and accompaniment to a track
• Getting Started Guide: the basics of generating songs from scratch

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Ready to revise a song? Get Song Creator Pro on the Microsoft Store for $49.99. One-time purchase, unlimited AI music generation, runs entirely on your PC. Also available on itch.io for $44.99.