All finished now. Decided to not copy the whole drum track and just overlayed the count-in with a louder version and pasting in the the drum part for the pickup beat. My first regenerate did not produce synchronized count-ins, but subsequent regenerate requests produced very acceptable results.
On the positive side of this work around I can still change the speed and regenerate tracks and make any other structural or chordal song changes.
On the negative side I can no longer make style changes as those would introduce a non-matching pickup / song style change going into the first bar.
A couple of BIAB behaviors I unexpectedly stumbled over are that
1. The count-in volume control does not seem to work for real track drums (based on the parameter value range it looks like a MIDI specific setting)
2. The count-in pattern is only a global preference and not song specific, which would be nice to have for songs with different number of pickup beats. But maybe the smart lead-in option combined with a muted pickup will produce a dynamic count-in adapting to the song pickup length.
3. There seems to be no option to move an audio track segment. The workaround seems to be using repeated cut and pasts to get it in the right spot when a fine lineup with other tracks maters.
4. The snap option is almost useless for real track segment identification as track segment entries relating to different instruments are pushed slightly different and the length of notes held goes slightly beyond bar beat times. That said, a bit of patience and trial and error got me close enough to grab what I needed and placed it in sync with the rest of the song.
5. The cut function does not seem to always remove every ‘sound’ from the selected region, even when repeatedly selected and cut. The left over ‘waveform’ does not have a lot of amplitude and is always short (at least what I saw) and may just be a waveform display artifact, but it’s hard to tell for sure.

Thanks again for all the feedback. It got me moving in the right direction and a good result.

Last edited by MartinDorr; 07/12/21 02:42 PM.