Best way to do this is to store the current cvar sound settings, set the ones you want, then change them after you're finished.
So...like this:
Code:
local oldEnableMusic,oldLooping = GetCVar("Sound_EnableMusic"), GetCVar("Sound_ZoneMusicNoDelay")
SetCVar("Sound_EnableMusic",1)
SetCVar("Sound_ZoneMusicNoDelay",0)
Then just restore the original values later.