No, it is not backwards compatible. You can't save in later version and then try to bring them back in earlier versions of Sonar. HF ----- Original Message ----- From: Henrik Leander To: ddots-l@xxxxxxxxxxxxx Sent: Monday, October 08, 2007 2:48 AM Subject: [ddots-l] CWB compatibility Hi. Is it possible to export a cwb file from Sonar 6 and import it in Sonar 4? I tried with a cwb file with only pure audio tracks without any effects and a drumtrack where cakewalk tts1 was used, wich should be the same synth in sonar 4 as far as I know. When I try to load it in sonar 4, some error message comes up telling that things can sound different because the file is saved in a newer version and there's an ok button. But the project doesn't open at all when ok is pressed. Is there any settings I can change for the saving or loading that would help? Cheers /Henrik