Determines if the sound with the given handle is still playing.
sound handle that was returned by the play function.
0 if a sound with this handle isn't playing, A7.82 otherwise the current play position within the sound buffer in bytes.
SOUND* whosh = whosh.wav;
var whosh_handle = ent_playsound(my,whosh,100);
while(snd_playing(whosh_handle)) // while sound ist playing