Hi,
I got frustrated one day at how fragmented this information is and so I tried every CC# in order to see what they might do. (whew!)

Quick List of CC# functions for Aria (Garritan) in Real Band
These are used in Piano Roll Mode

1 Mod Wheel
7 Volume
11 Expression
12 Breath Noise (horns mostly)
15 Releases for Trumpets (Falls, Doits, Kisses) (See cc# 29 below)

16 Plunger mutes for wah wah effects in brass

17 VIBRATO speed (see CC# 79 below)

18 Buzz (Horns mostly)
19 Pit Bend defeat (Comes in handy sometimes)
21 Length control

22 Intonation control (Really handy)
23 Timbre control
26 Warmth (Makes Brass sound bigger)
27 More warmth ??
29 Release effect Volume (see cc 15)

79 VIBRATO (aftertouch ) (see cc# 17 above)

91 Reverb Depth independent of RB controls

102 Auto Legato (useful for Trumpet Shakes. Just add overlapping trill notes)

You'll notice a lot of this stuff pertains to brass. Okay, so I'm a trumpet player...(lol) Hope this helps someone.