I have ever used. I used SONAR from the beginning, up to ver. 6, and then, because I had alot of M-Audio hardware, went to ProTools M-powered, then moved to a 003 rack (Black Lion Audio Sig Series mod), and now PT 9, which has ADC, and allows you to use pretty much any interface. I decided to try SONAR again, and bought a "upgrade" version. the first problem I encountered is that you have to download a ton of files, and then they must all be in the same folder to run...I think...I STILL cant get the "extra content" to install, so when I open a demo session, it tells me all kinds of plug-in files are missing..the next problem, that has been on-going for almost a week now, is that SONAR X1 (and I have d/l'ed BOTH patches) does not like the Digi 003 rack interface. I have tried everything, using ASIO drivers, WDM drivers..everything. The software will work with the 003 in WDM mode, to a degree, but at low latency settings that PT works flawlessly with, SONAR pops and clicks. If I adjust anything having to do with latency, in WDM driver mode, the program locks up, If I run in ASIO mode, the time line ruler will move about half a second and freeze, as the audio keeps playing. I tried recording like this, with a live input, no dice. The software synths sound incredible...when they work and don't lock up. I called Cakewalk support, and was told that the Digi hardware needs standalone drivers to work with SONAR..he thinks..So, I searched Digi's (AVID) sight and there ARE no standalone drivers that would also work with PT 9. Isn't this something that Cakewalk should warn people who own this hardware about, BEFORE they plunk down thier hard-earned money, and sit around for a week trying to make the two work together?? I have yet to record a single note into this software. I really, really wish I could get my money back...that is about 12-16 hours of my life that I ill never get back, and I could have been recording something in ProTools...sorry, Cakewalk, barring some sort of miracle, like one of your tech support people actually tries to help me and comes up with a solution thats better then "well, your hardware just wont work with our software, sorry we didn't warn you before you bought it", you have lost me as a customer forever....