a screw it. ur sounds aren't playing because (watch developer mode carefully) they are in the wrong format. I tried a custom alarm sound and everything was set up properly, but when a played it, the developer said the sound pathname and something about stereo.
To fix this, open up sound recorder "Windows: Start/Programs/Accessories/Entertainment/
Sound Recorder", and then open your sound. then go to Save As... and below where it shows "Save as type:" it shows the format of your sound. click on "change" and set the format to PCM and the Attributes to "11,025 Hz, 8 bit, Mono. That is the standard and I think required format for CS and HL sounds.
Hope you fix it...