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BTW, /dev/dsp is your sound device (sound card). Have you turned up the mic input slider in audacity? it's over to the right somewhere. at the top and under the toolbar and sound monitor... does this help?
In the middle of the Audacity main window, do you see the two sliders for setting output volume and input volume? Right-most of it you should see a combo-box where you can choose the input channel. Choose "Mic" or "Line1" or whatever is appropriate for your audio configuration. If you don't see that combo-box, what do you get for "rpm --query audacity"?
I also had this problem (although not on Fedora) and found a simple solution: Run alsamixer in a console, press F4 to switch to Capture mode, and make sure the mic level is turned up. Before doing this, I only had the Playback mic level turned up and could hear my voice, but not record it.
alsa-lib is irrelevant here, as current Audacity doesn't use it, but only OSS. And OSS is kernel level for Audacity, even if ALSA provides the OSS devices. Hence if you select an input source in Audacity (described in an older reply above), the audio channel routing done by ALSA's OSS layer may need to be adjusted with tools like alsamixer.