To emphasize the importance of doing a "save as" backup of your work, and also to point out a potential bug, I offer the following tale: I'm currently doing some drum program for a guy in VA. I'm working from CD's he mailed me, and I'm using Doggiebox to fill in drums on audio tracks that came off the CD's . I'm using Cubase to put things together and check my programming. The song I'm working on is just over three minutes long, and I had about three or four hours into the programming. For no reason at all, I played with the "Master Tempo" slider. I set it back to 100% then did a save. When I exported a wav file to check the patterns in Cubase, I noticed an immediate problem with Tempo. I went back to DB, and saw that the slider still read 100%. There is no chance that I exported while the slider said anything other than 100%. I was able to open a backup song file, then copy the changed patterns from my (now bad) song file into it. Problem solved. I think there may be something wrong with the way the slider works. I'd advise "hands off" unless you know what you may end up with. Do a backup.