I figured it out. It's just like 320mb said, it's feedback.
First, you'll want to disable the alarm output; the best way to do this is probably by plugging headphones in. I plug them into my dock; it should help if you plug them in to your computer directly as well.
Once you've done that, enable audio: /etc/init.d/sound start
Then open KMix. To tell you the truth, I really don't know what half of that all means, but all I had to do was:
Go to the "Input" tab. Click on the green light on 'Mic' to turn off the green light. That should do it.
For further experimentation, do the following:
Make sure 'Mic' is turned off. Now Click on the "Advanced" check box. Now click on 'Mic Boost' and make sure its green light is off.
Now click on the 'Mic' green light again to turn it back on. You'll notice that there is some noise generated by your speakers, presumably because the Microphone's input is being sent to the speakers as output.
Now if you want to hear the "deeply scream" part again, just click on the 'Mic Boost' green light to turn it back on; but then turn it back off!
Now if only I could find some documentation that told me what all those things in KMix (and alsamixer) really mean...
Also, I don't think I have audio through the dock into the headphones working yet. That, as I understand, requires usb-audio support in the kernel. I'm not sure if that's enabled in my Mandrake 10 install or not...
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the speakers of my Dell D800 deeply scream!!!
