>> In the chord sheet drop down, explain the grooves that are surrounded by brackets [ ]. It seems to be a subset of the the opposite part, but not a complete set? And if you choose one of these, the part switches from a to b, or b to a. At which point you have access to all grooves for that part. I don't get the purpose of this? If I want the part to switch from a to b, or b to a, why wouldn't I do that normally. And if you are giving some shortcut here to do two things at once, then why don't you show the complete list of grooves for the opposite part in brackets?

The [ ] brackets indicate that choosing that groove will change the substyle (from 'a' to 'b' or vice versa).
The full list of grooves are shown, some are in brackets to indicate that this will change the substyle if chosen.

For example, for the RockClassicBritEv, you will see 6 grooves:

Snare,Closed Highhat
Snare, Loose Highhat
Snare, Open Highhat
Snare, TomTom
Snare, Ride Bell
Snare, Crash Ride

You can choose any of the 6, at any bar, to get a custom drum treatment for the song.

Have Fun!
Peter Gannon
PG Music Inc.