asus netbook and orca

[mike]

Hi, this is a little off topic, but maybe one of you know the answer. My new asus netbook is working berry well with Orca. But the internal speakers are a little high pitch and not the best to listen to.
   Is there any way to deepen the base a little on the asus netbooks. I know fn and f 11 or f12 will change the volume. But I didn't find any key for treble or base. If this isn't possible, are there any companies that make small USB speakers?
Thanks Mike.