[pygame] sndarray tutorial?

[Joseph Blaylock <blaylock@indiana.edu>]

I would like to write a simple application to produce single tones, chirps,
and simple oscillating audio.  After tooling around on pygame.org, I decided
that the best way to do this was probably to generate appropriate numeric
values and use them to initialize a call to pygame.sndarray.make_sound().  I
can't seem to get it to work at all, though.

I'm new to pygame and may be missing something, but I've google'd for sndarray
in every permutation I could think of, and haven't been able to find any kind
of tutorial or example document or howto.  None of the projects linked from
pygame.org seem to use it, and I didn't really understand the source when I
tried to read it.  So I decided to write the list for help.

Do any how-to style documents exist for sndarray?  What does make_sound
require from the Numeric array?  e.g., how should it be formatted and typed
and so forth?

I was quite surprised when I did this in the python interpreter:
>>> a = sndarray.array(mixer.Sound('/usr/share/licq/sounds/Monty-Python.wav'))
>>> s = sndarray.make_sound(a)
    Traceback (most recent call last):
      File "<stdin>", line 1, in ?
      ValueError: Invalid array datatype for sound

I would have thought that pygame.sndarray.array would return an array useful
to sndarray.make_sound; this has me pretty bewildered.

Any pointers or sample code anyone can provide would be very helpful.

Thanks.
    Joe

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