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Aw, that's just unforgivable. Between that and all the sound glitch problems (still) on all the post snow Leopard OS versions (do a search), there is nothing in this new version I need for the foreseeable future.
Sorry Apple. This is not going to force me to "upgrade" my OS. Not this time.
And looking at the demo of drummer on you tube? The "following" of the chunky guitar track is completely unacceptable. I predict a whole lot of horrible sounding TV soundtrack music in the future, more horrible than the "needledrop" sample programs of today.
I AM glad Apple made this app; it's just not for me. If I ever do install it, it will be on a COMPLETELY separate drive with the new OS, and I have a feeling I'll never use it beyond a few hours of experimenting.