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# Unison Mode for vocals
Combine multiple AI voices into a single unison track in ACE Studio.
## What is Unison Mode?
Unison Mode lets you combine multiple AI voices into one vocal track.
You can save your custom unison presets to the Voice Library. We also provide pre-made presets.
To use a unison preset, drag it to the canvas or onto the track header.
{% hint style="info" %}
In ACE Studio 2.1.1 and earlier, Unison Mode for vocal tracks was called **Choir Mode**.
{% endhint %}
## Turn Unison Mode on or off
### Enable or disable Unison Mode
Click the header of a vocal track to open the track panel. To enable Unison Mode, click Turn on Unison Mode. Turning Unison Mode off clears its settings.
You can also right-click a vocal track and select **Turn into a unison track**.
### Add or remove voices
* Click + Add to open the Voice Library, then click a voice to add it to the unison track.
* Right click on a voice to duplicate or delete it.
* Arrange the order of voices by dragging them.
### Edit parameters
* Offset: Adjusts slight timing differences between voices for a more natural effect.
* Spread: Controls the stereo width of the layered sound.
* Gain: Sets the volume for each voice under the avatar.
## Effects for Unison Mode
If you want to create a sense of space or use it for backing vocals, use Room Effect.
To learn more about effects, please refer to [Room Effect](/project/mixing/effects/room-effect.md).
## Save as a Preset
In the track panel menu, you can save the current unison setup as a preset. You can customize the preset's name, tags, and language for easy retrieval. Your preset is saved in the Unison tab of the Voice Library.
The presets you save will be stored in the cloud and linked to your account.
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