Streams

AA = Police Radio Scanner
ADVERTS = Advertisements on Radio
AMBIENCE = Ambience Sounds Ex Water
BEATS = Miscellaneous Music (Music in Disco etc)
CH = Playback FM
CO = K-Rose
CR = K-Dst
CUTSCENE = Cutscene Audio
DS = Bounce FM
HC = SF-UR
MH = Radio Los Santos
MR = Radio X
NJ = CSR 103.9
RE = K-Jah
RG = Master Sounds 98.3
TK = WCTR

SFX 

FEET = Footstep Sound Effects (You should have this already)
GENRL = General Sound Effects ex Weapons,Cars (You should have this already)
PAIN_A = Pain Sound Effects. (You should have this already)
SCRIPT = Voices during missions (Not Cutscenes) and Police scanner reporting crimes.
SPC_EA = Pedestrian Voices. Emergency Services.
SPC_FA = Pedestrian Voices. Girlfriends, Food and Shop Vendors, Police Boat Loudspeaker.
SPC_NA = Pedestrian Voices. Gangsters.
SPC_PA = CJ Voices.
SPC_GA = Pedestrian Voices.

By Yashraj.