# Versions

> Stack mixes under one song, pick the main version and clean up old ones.

Source: https://docs.wavdrop.link/versions

A song can have many versions: mix 1, mix 2, the master. They stack under one song, so your project stays one clean tracklist instead of "final", "final2", "final-FINAL".

## Add a version

Two ways:

- Open the song's menu and choose **Upload new version**.
- Drop the file onto the project. If its name matches the song, choose **Stack as a new version** in the review.

The new version becomes the song's main version, and it's what plays first.

## The main version

The main version is the one at the top of the song. It's what your client hears when they press play, and they can still pick an older version from the song.

To promote an older one, open its menu and choose **Make main version**.

## Demos

Mark an early sketch with **Mark as demo**. A demo sits before version 1 and isn't counted as a version. **Remove demo mark** turns it back into a normal version.

## Split a version off

Uploaded something to the wrong song? Choose **Move to its own song** on that version. It becomes a separate song in the same project.

## Delete

Choosing **Delete** on a song with versions asks what to remove:

- **Latest version** removes only the newest one.
- **Entire track** removes the song and every version of it.

> [!WARNING]
> Deleting can't be undone. Download anything you want to keep first.

## Compare versions

Not sure which mix is better? Use [A/B Compare](https://docs.wavdrop.link/ab-compare) to play two versions in sync at the same loudness.