Eh... can you explain what you mean with 'Standar Sound in WC3'?...
- Combat sounds depends on every unit.
- Unit sounds too, depends on every unit.
- Music, I think there's a trigger that clears all music list or Music qeuqe, or something like that.
The only 'destroyable' sounds are those used in variables (udg_sound or gg_snd_Sound), the rest you can just turn them off (Sound - Set Volume of Sound/music Channel to %).