Are SONAR 6 files backwards compatible with SONAR 5?
“Yes, SONAR 6 files are backwards compatible all the way back to SONAR 3. As long as you don’t save projects with 64 bit audio they will open in SONAR 3. To clarify – obviously SONAR 5 won’t understand any new features from SONAR 6 such as audio snap and will discard this information when the file is loaded. So if you do save in SONAR 5 make sure you save as a new file name – otherwise the new data will be lost permanently on resave.” (SOURCE: Noel Borthwick, Cakewalk (http://forum.cakewalk.com/tm.asp?m=863411#)).