What process are you testing? Can you post the 16 bar audio file online so others can test it?

What steps are you following to import the audio file? I don't have the manual for 2015 Band-in-a-Box (BiaB) for Mac but in 2020 BiaB for Mac you can either start at "File" > "Import" > "Import Audio" to open a dialog box and select the audio file. Or you can start at the "Audio" menu selection.

What are the settings in the BiaB for Mac Import Audio dialog box? Are you selecting merge or overwrite? What is the time setting? Does the dialog box identify the audio file as an Apple loop?

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Clipboard01.jpg (24.56 KB, 22 downloads)
2020 BiaB for Mac Import Audio Dialog Box.

Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home