Good questions

1: BiaB has always had the limitation of the number of Tracks available. (RealBand gives you 48 tracks)

2: You can change the transparency of the mixer and tuck it into a corner with the 'A' button. Otherwise you just have to hide it manually.

3: You can have a maximum of 4 chords per bar but the bar doesn't get divided. It actually contains two cells. The left hand cell can hold chords on beats one and/or two. Enter the first two chords in the LH cell, separating them with a comma. Repeat for the RH cell e.g.
Eb,Bb7 Ab,Fm7

4: There are options for count-in but they are global. Whatever you select plays for every song. Not ideal and there is a wishlist items of many years asking for it to be changed. You may wish to add your endorsement. However, I have no idea how PGM decides if the users' practical requests are worthy of delivery.

Options > Preferences > Count-In to set you preference.

Hope this helps

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