i can't get sound_vol to work. first of all, f12 doesn't work. shouldn't it toggle all sound effects on and off?

then if i try to do this:

sound_vol=0;
ent_playloop(my,snd_test,500);
sleep(1);
sound_vol=100;

i can't hear anything? without the sound_vols it works...

...
this doesn't work either:

ent_playloop(my,snd_test,500); // it also doesn't work with ent_playsound
sound_vol=0;

sound_vol seems to get ignored.

...
am i missing something or does anyone have the same problems? isn't sound_vol a way to control the global volume of all wavs currently playing?