Haven't recieved a message back yet (hopefully my slow interwebs didn't botch things up in the sending process), but in the meantime I've been playing around with what instruments are played in different songs. Ironically enough, I found that the Chocobo whistle works very well for the star-streaking sound heard during the Moon Overworld song.
I also decided to mess around and plug the BRR offsets into a hex calculator to get some sort of grasp on the size of the BRR samples themselves. Not exactly sure if it's an accurate way of figuring that out, but for those who are curious I have them listed below. Instrument names follow the terminology of Chillyfeez's FFIV Music Hacking Guide, other then the fact I renamed "Whistle" to "Ocarina" and "Chocobo" to "Whistle".
Also, only 01 - 10 have their offset differences recorded as of now, as not all of the offsets are known (so I have no offset to subtract 11's offset from)
## Offset Name Hex Difference
01 $2498A: Strings (Bowed) 17A2
02 $2612C: Strings (Plucked) 110
03 $2623C: Grand Piano 308
04 $26544: Edward's Harp 2333
05 $28877: Organ B42
06 $293B9: Trumpet 1B2
07 $2956B: Flute 185
08 $296F0: Xylophone 1ECE
09 $2B5BE: Bass Guitar 5EA
0A $2BBA8: Timpani 2333
0B $2DEDB: Electric Piano 14F6
0C $2F3D1: Snare Drum (Low) F68
0D $30339: Kick Drum 551
0E $3088A: Snare Drum (Hard) 12BC
0F $31B40: Conga Drum (Light) 12B6
10 $32DF6: Cymbals (Crash) 1307
11 $340FD: Hihat ?
12 $00000: Cowbell ?
13 $00000: Shaker ?
14 $00000: Ocarina ?
15 $00000: Conga Drum (Full) ?
16 $00000: Whistle ?
Now I just need to know a bit about BRR sample headers and I'll hopefully be good to go. Most importantly, the general size and location of them:
1: Are the headers generally located at the beginning of each BRR sample, or are they stored in a different index elsewhere?
2: Do they have a generally uniform size (8,16,32 bytes?) or do they vary from game to game?