[pygame] varying sound playback rate

[Miriam English <mim@xxxxxxxxxxxxxxxxxx>]

Hi,

I'm new here. I've looked thru the archives, the pygame documentation, 
the site and tutorials, and I've tried experimenting myself, but I can't 
find a way to dynamically alter the rate of sound playback in pygame.

For example, if I wanted to play a sound file back thru 4 different 
channels at 4 different rates to form a chord... is it possible?

Another example: playing the sound of a train "chuffing" first at a low 
speed then at progressively higher rates to sound like it is pulling 
away from a station... is that possible in pygame?

I know that it is possible to use numeric to read a sound into an array 
then manipulate it to create different sounds, but this seems a bit like 
using a steamroller to crack a walnut. I've used other applications 
where simply setting a different play rate is sufficient. This is 
effectively what all "tracker" music programs do. Can pygame do this?

Thanks in advance for any info.

Best wishes,

	- Miriam