I am thinking that it is just how BIAB works.

It is keeping track of a large database of audio and inserting pieces and pitch converting in real-time. It would probably benefit from larger buffers, not smaller ones.

The seams are more noticeable if you solo the tracks.

When you render them to audio, I think it is inserting fades in the audio tracks at the transitions, and that smooths things out. I just have to get used to it.

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