Nigel,

Thanks for the added information. It helps understand your situation better.

My experience suggests that combining a bass Realtrack designed for use at 85 bpm and a piano Realtrack designed to be used at 165 bpm is fraught with difficulties because either the piano would need to be stretched too much to fit to 85 bpm or the bass would need to be compressed too much to fit to 165 bpm. I would anticipate that such stretching or compressing would lead to very noticeable audio artifacts in the generated tracks.

The above said, and you may already be doing this because I can see that you have a lot of experience with BIAB, it would be possible to set the piano to 'double time' in the Realtrack picker when loading it. This will then fit much better into 85 bpm. Similarly, if wanting to play at 165 bpm, the bass Realtrack could be set to 'half time'. Audio artifacts would then be reduced significantly.

Out of curiosity, I loaded the _RBILYSW.MGU. This songfile contains Piano #2498. I generated the song and transferred the piano and drums tracks to my DAW. I then set the grid on my DAW to 1/16th note triplets to accommodate the swing style.

As can be seen on the image below, the drums align really well with the grid. The piano notes, on the other hand, are often between the 1/16th note triplet beats (I've marked with a red line the part of the track that should reasonably align with the triplet; two 1/16th note lines = 1/8th note triplet). This seems to be true for much of the track and the amount of variation is reasonably consistent. As I see it, this supports what you say about the piano track being loose with timing.

I've reported it to the development team and given the URL of this thread for their reference.

Regards,
Noel

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