This new feature Sync playback seamlessly with your DAW—such as Presonus Studio One or Pro Tools—including support for floating-point tempo is what a lot of folks have been waiting for.
The good news is that DAW plugin follows the tempo map that has varied tempo changes just fine. The problem comes when you drag them files from the BIAB plugin over to Studio One. They will not conform to the tempo changes because these tracks have no tempo information in the audio wave file.

Automatic timestretching is based on the relationship between the Song tempo and the audio file’s tempo. Each Audio Track has a Tempo mode that controls the behavior of the Events on the Track, based on the Song tempo. The Tempo mode can be selected in the Track Inspector. The following modes are available:
I usually set this to time stretch mode.
For automatic timestretching to work as described, Studio One needs to know the original tempo of an audio file. The software can then calculate how to stretch the file to fit the Song tempo. Many audio loops have this information encoded.
But since the DAW plugin does not include this in the wave files being dragged over you must set each track manually.
If you look in the track inspector panel near the bottom you will see a box labeled file tempo and it will read Not Set. You need to enter the correct tempo of the project here. Then you need to set tempo at the top of the inspector to timestretch.
You must do this to each wave file that is being dragged over to the DAW.
I have no idea how other DAWS work without a embedded tempo in the wave file?

On a Developer side note: Is it possible to include the file tempo of the generated track being dragged over? Also what about generating a output chord track like in BIAB?

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BIAB 2026 Ultrapack- Studio One Pro 7 Windows 11, Mac Mini M4 with Logic Pro 11, Melodyne Studio, Luna Pro