as a music major we did a lot of aural training, over 2 years, and most of it was on a piano with a professor, and sometimes on the computer. but i'm not quite sure thats what your looking for. i will suggest looking into Earmaster. I used that a while back, and my brother in law teaches with it at a music school in LA. if its frequencies you want to experience and listen to, go into whatever audio editing program you use be it cool edit, wavelab ect. and they have frequency generators. that also might help, good luck.
matt