Use either Getosc or Getpsec command...
First variable : The music data it gets the data from... Can be from 0 to 1. 0 is the lowest in frequency (Bass, etc) while 1 is the highest. I believe the most detailed it can get is 1/288-288/288 (288 bands available on SSC).
Second : Smoothing (Best for getosc). Instead of just getting the value, it calculates the average within the variable... So if you want to get the data from 0.5 with 0.1 smoothing, you'll get the average of the values of 0.4 to 0.6.
Third : Channel. 0 is center, 1 is left, 2 is right.
I might not be accurate... (Well actually I am, but I can't get the right words)
[soon to leave, sirs]