[pygame] SndArray Question

[Kris Schnee <kschnee@xxxxxxxxxx>]

I've built a crude speech synthesizer, and am thinking about how it 
could be improved. I'm having trouble, though, because I don't 
understand the format that Pygame uses in its SndArray module. Eg:

CHIMES = "chimes.wav" ## The name of a WAV file in this directory.
pygame.init()
x = pygame.mixer.Sound(CHIMES)
x_arr = pygame.sndarray.array(x)
x_arr[:5] ## Look at the first few entries.
Result:
array([[2, 3],
       [9, 6],
       [7, 2],
       [5, 0],
       [3, 3]],'s')

What does this data mean, exactly? I assume that since the length 
depends on the sound's length and each entry is a two-part list, and the 
pairs of numbers usually are the same, each entry represents stereo 
frequency data at a point in time. Is this so? If so, where's the volume 
data?

Kris