need to clarify, what volume
why do you mention winamp?
use carwings... the volume on the LOWER LEFT is MASTER VOLUME...
now thats simple on modern os like WIN7/win8, but XP SP2?!?!?!? if anything SP3
its all up to the DRIVERS of the SOUNDCARD
and a key setting the master volume map setting
hell if i can remember what it should be...
try in RR.ini: