Yo MGS [monosodiumglutamate?]
I have a great classical guitar patch on my Yamaha DX-7 synth; and, I record it direct into the MD-8.
Now, if you are playing your ax with no amplification, you will still have a good strong signal; I think the mic you choose will be most important. You can check the mic section of this site, as well as other information available, and this should help you.
When you add in some FX to your ax, you should sound great.
The vibes from a classical guitar come through pretty well with any decent recorder, 4/8/ track digital would be best; but if you have cassette tape, you should still come out with a decent sound. Make sure your signal is up there on your meter scale, right near clip.
Experiment a bit; check this site for more succint information, especially from the guitar players.
Happy sounds,
Green Hornet