Thank you, Edgar. I should have explained my issue a little better, but, what it amounts to is this. I had a number of of Garageband projects already recorded, in a previous iteration of Garageband, (6.05), prior to the release of Garageband X, (which comes with the new Drummer facility), and I was a little careless with setting parameters, since these projects contained only audio files, (guitar parts and vocals), and setting tempo, (BPM), accurately was not crucial at the time I recorded them.. The drum parts of these were simple beats played 'by hand' using a midi controller, just kick drum and snare, which I 'played' to 'match' the feel of the audio files, or, in a couple of cases, using Apple drum loops. My plan was to replace these 'drum tracks' in each project with 'Drummer' tracks to produce more authentic drums, with fills, etc, by loading the projects into Garageband X, but, I now find that I cannot do this, since the audio files do not match the BPM of the project, as set in the original settings of each project... So, simply inserting a Drummer track does not work well, as the 'Drummer' is following the BPM setting of each project, but not the actual, (real), BPM of the audio regions.
I seem to have made my musical life a little complicated, by not working in a very careful, rational way!
It's kind of you to try to help, but it seems I'll either have to re-record this work from scratch, or find some other work around. Whatever, I've learned a good deal from this experience, and I'll certainly be much more careful in future! :-)
Many thanks,
ontradio. :-)
PS, Sorry I took a while to reply, but I've been away, and offline for a day or two.