This just came up the other day. You
can change the sample rate of a project, but only if it has no audio in it. So the drill is this:
1. Set SONAR's default rate for new projects to the existing project's rate.
2. Open the project, and export all the tracks individually as Broadcast Waves at their native sample rate and bit depth with names that will make it easy for you to know what tracks they came from (the default naming for track exports may be enough).
3. Delete all the clips in the project, which will disassociate them from the project without losing the original stored audio files or the exported copies.
4. Change the default rate in Preferences to the new desired rate, and the stripped project will change with it since it contains no audio to prevent that.
5. Import the exported files back into the project, track by track, and SONAR will do the sample rate conversion.
Note that you can skip step 2 if all the audio tracks begin at 00:00:00:00. The purpose of that is to make it easier to get audio clips that didn't start at time zero re-imported to the right times. Credit for this suggestion goes to Guitarpima.
Here's the other thread for reference:
http://forum.cakewalk.com/tm.aspx?m=2381153
post edited by brundlefly - 2011/09/08 19:19:54