Music CV’s are pretty standard, and in terms of other schools you are applying to that is common as well. From everything I have learned I wouldn’t sweat the details of that so much, the number of public performances and the like is not likely to count that much anyway, and in terms of a masterclass I don’t know how much, if at all, that would weigh (some masterclasses are truly public, where they invite the general public to sit in, others might be limited to students at the program, one might be considered more public than another). Ensemble experience might help, especially with an orchestral instrument, but again I personally wouldn’t sweat that, because in the end it likely is going to come down to the audition, pure and simple, if they look at the CV and whatnot it might be in the case of a tie, where they are deciding among several students for a slot, with the studio on the other hand I believe (and it is only my opinion) that with a teacher it is going to come down to the audition, a teacher might look at the CV if they seem to recall seeing the kid and use it to refresh their memory I would guess, but again I wouldn’t sweat it, this isn’t an academic admit with stacking up EC’s to impress the admissions people:)