Originally Posted by AudioTrack
In answer to your first question, it is my understanding that the stem separation is handled 100% offline. The system does not need an internet connection for stem splitting.
Thanks.

Originally Posted by AudioTrack
I'm also not sure if the stem separator function is AI based, as suggested in the post title.
Based on the announcement of the feature, it is (bolded for emphasis):

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We’re excited to introduce an amazing new AI-powered feature - The BB Stem Splitter!
This powerful tool separates any multi-instrument audio file (.mp3, .m4a, .wav, etc.) into individual tracks - bass, drums, guitars/piano, vocals, and residual sounds. These tracks are then added separately into your song, allowing you to generate Band-in-a-Box tracks to play along with. Using advanced AI and machine learning techniques, this process, also known as “audio source separation,” offers greater flexibility and creative control in music production. For example, you can import vocals from your favorite singer and rearrange the backing tracks in Band-in-a-Box® to create a unique, personalized mix.