well for a quick 'n' dirty way of doing it ... this will depend on your sound card btw, if it can record "wave" or "what u hear" etc. either that or you getting a speaker -> line in cable
find cooledit 96 trial and/or musicmatch jukebox v6 somewhere around, or comparable softwares (i might be able to send you installers for these, if i haven't lost them in the 5-to-8 years ive used em). old, basic, but do the job you need.
cue up the thing you're going to record
open volume settings, use menus to switch into record mode, make sure the appropriate slider is at maximum and everything else is mute.
start recording in cooledit (to cd quality, 44k/16bit/stereo) or musicmatch (if you want to directly mp3 it) from non-CD source, put a test segment through it to check it works and volume. check the length so you can put a length limiter on MM if thats what you use.
then do the whole thing, only runs at 1x speed so go get a brew.
crop down and save file if using cooledit, or check it autosaved with musicmatch, have a little listen through to make sure it's not screwed.
celebrate
rather a crappy writeup i know, but hey ... i'm working in the other window...
that's the basic principle - record direct from Wave part of mixer if possible, or use a Line-in loopback if not (oh - i forgot - make sure to MUTE line-in on the "play" volume control, otherwise mega feedback!)... get a good, standard wave editor or mp3 recorder to lay the file down with, check it then set 'n' forget for the length of the set. done.
alternatively you could just hook the speaker outputs into your home stereo, plonk a tape in the deck, and record it that way ghetto stylez like it was coming fresh off the air!
(or indeed connect it to your mp3 walkman if it has line-in encoding capability)
there's ways and means of yoinking the actual data stream somehow, or at least transcoding it without it going thru the soundcard, but if i ever knew them, i lost the knowledge a while ago.