I just had a play around with the time mapping (ACW) and stem splitting in BIAB in order to be able to generate some RTs for a song.

It seems to work fine but it took me long time to come to that conclusion and try to understand what is going on.

Dragging in an audio file into the audio track and then marking up the time map in ACW and analyzing the chords seems to work ok.

Now making a stem split on the audio track with the time map to generates the stems in sync with them main audio is where it starts to confuse me.
The stems are generated ok but..

In the track view when looking at the audio waves for the stems and comparing them with the audio wave for the master audio track the stems are all “visually out of sync” with the audio track. But the stem files themselves are in sync with the audio track it is only the “visual representation” that are out of sync.

It is easy to check that the actual stem files are in sync when listening to a stem individually and comparing it with the main audio file, and also exporting all the stems and main audio and check them in another software like a DAW that shows the visual audio wave files correctly, they are all in sync.

Since I am not normally using this I might have missed something or doing something wrong but otherwise I wonder if it can be set somewhere to show the waves correctly in sync or otherwise what is the purpose of showing the audio waves out of sync with the main audio.

BIAB 2026, Studio Pro 8, Song Master Pro, Win11 Home. i7-9700K CPU, 32GB, ESI MAYA44eX, ZOOM UAC-2, Guitar Pro 8, Transcribe, (EZKeys2, EZD3, SD3, EZBass, EZMix3)
Amateur: fiddle, guitar, vocal, beginner on bass.