This issue seems to have cropped up recently, or maybe I've just started doing something wrong. Here's how it happens:

  • Create a new BIAB song, with any style.
  • Record MIDI from an external device, using a VSTi plugin such as Sforzando to the Melody track.
  • Select a VSTi plugin for the Melody track.
  • Save the song as an MGU.
  • Choose Quick Export and export to M4A.


The resulting M4A contains two audio streams of the Melody track slightly out of sync. It appears that one of the audio streams is an audio track that is created during the export process. Prior to the export the audio track was empty. So it looks like BIAB is converting the melody track to the audio track and also exporting melody track to the M4A during export, so there is a doubling. I can get around this by exporting to M4A, then deleting the audio track, then exporting again and throwing away the original M4A file. It's pretty consistent and persists after upgrading to Build 721. I've done a lot of exporting using what I think is the same method since I first got BIAB and I don't recall this happening before.

Has anyone else experienced this or do you know if it is a setting that I need to change?

Ed Z

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BIAB user since 2019
iPad Mini, Garageband for iOS, BIAB for Windows 2020 UltraPAK, Xtra Styles packs 6-9, Windows 10 Lenovo PC, Kontakt Player, SpitFire LABS, SampleTank 4 CS, some Soundfonts