Im working with Sonar and a friend of mine got a copy of Cubase LE with a Tascam unit he just picked up. Can he save a track recorded in Cubase in a format that I can open with Sonar 7?
I don't think you can.
The way I see this, is to export all your tracks as separate wav files, import them into Sonar and have fun.
Maybe Rewire could help.