A couple of things that I'd try that might help...

1) Under the "Audio" menu on the top upper bar, click on "Audio Drivers/Settings" and make sure that "Peak Limit" is activated.

2) Also under the "Audio" menu, click on "Export song as audio file" and try using the all the settings that I have on the image below. See if these work.

(Make sure that "Normalize" is off. This can easily be done in a daw. I'd also export as 16 bits and 44.1 kHz as these settings are BIAB's native formats.)

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MY SONGS...
Audiophile BIAB 2025