Peter,
As Jan said, you can get TTS-1 to work in Vista 64, and I'm assuming Win7. I have that on my laptop, but don't have Sonar on that, so I can't try it there. I'm sure it does, though.

The XP mode in Win 7 Pro is for older programs, primarily business programs, CAD, Financing and Accounting and such that isn't supported in Windows 7, or Windows 7 isn't supported in that software, so it allows you to upgrade the computer, and still have the ability to run it. It is only in the Professional version, and I wouldn't want to try to run BIAB, VSC, or anything like that with it.

Gary

I'm blessed watching God do what He does best. I've had a few rough years, and I'm still not back to where I want to be, but I'm on the way and things are looking far better now than what they were!