Help me figure out how to...

Audiosnap. The offline algorithms should be used once you get the timing the way you want it.

Are you ready to mix? The easiest way might be to mix without the tempo changes, and then bring the mix into Reaper and do the tempo adjusts there. Much more control with a fraction of the hassle.

If you're not ready to mix... and want to hear the tempo changes as you continue production... hmmm... are you ready to render the MIDI? If so, then I would again advise doing that without any tempo changes, then render the appropriate stems, import them into Reaper, and again, do the tempo shifts there. After adding the tempo changes in Reaper, you can render the individual tempo-adjusted tracks, and bring them back into Sonar for mixing.

If you're not yet ready to render your MIDI, but still want to hear your tempo changes as you continue recording MIDI or audio... then in many ways Reaper is again the best way to do that, BUT it's not nearly as easy as the two suggestions above... cos that would essentially amount to shifting platforms mid project, and that's not a good idea -- unless you already know the other platform, and even then it might not be a good idea. In that case, you're probably better off doing it in Sonar. But I've always found after-the-fact tempo changes in Sonar, especially involving both MIDI and audio, to be a pretty futzy and trying process. Not sure I've ever successfully done it, though instructions for doing it are all over the place. Hence my suggestion to wait until as late as possible, even post-mixing, and then do it with Reaper. At that point there's not much to it and it'll probably take you less total time, and sound at least as good, than doing it sooner in Sonar.

If it's in time now, and I change the tempo, why doesn't everything move the same amount?

That's a great question. If only there was a good answer for it.

Thanks for the enlightening replies/thoughts on the matter. I will take a copy of the chart and try Audiosnap yet again. But as well, I think I'll try Marah's Reaper after the job is done idea. Still listening for a consummate 'Do it like this' reply...

My suggestion is to bounce everything down to 2 track... Then open a new Sonar project... Import the file..

Then select the parts you want to apply the tempo adjust... everything will be lined up already and it will adjust the one track to whatever you want....

Another way to do it is to export the audio/midi to a 2 track.. then cut the 2 sections you want to change tempo out of the 2 track.. import them into Sonar and adjust tempo.. then export them and splice them together..

Have fun

brundle