>>> Leadsheet window and Conductor are still only for the windows version?
You are correct, the leadsheet window and conductor feature aren't present on the Mac version. We are working on these things, but our main focus is the musical output, available styles etc., which is identical on both Mac and WIndows.
>>> when the "real"-thing started (I missed that update, and I see now that I didn't miss much...
If you are referring to RealTracks, well I think that was a good upgrade.
>> in stead, all it really is usable for, is for horn players to practice their improvisations
Lots of people use Band-in-a-Box for more than that. For example, check out the User Showcase Forum
http://www.pgmusic.com/ubbthreads/postlist.php?Cat=0&Board=usershowcaseThe 100+ songs in this forum were made using some or all Band-in-a-Box tracks, with additional tracks (vocals etc) added in a DAW.
As you may know, you can drag tracks from Band-in-a-Box to GarageBand, Logic or other DAW's.