Line out recording
 

I have a digital piano from which I have made occasional recordings using an old and inexpensive MP3 player. The problem is that after switching to Vista, it doesn't work anymore (the drivers for the old one were in fact for Win 98, I was already glad it worked with XP), and the recording quality was only decent, but not outstanding - in any case not nearly as good as it came out of the headphones, even with 192 kbps.
The piano has three standard TRS 1/4" outlets (one for stereo headphones, and two for Left and Right). So far, I have tried to connect it directly to my notebook, but the quality wasn't very good (too much noise, signal too weak) and my old minidisc recorder (from which I couldn't transfer the data to my notebook due to its weird copy protection system).
Has any one of you any experience with this sort of recording? I'd really like to make a CD of my own - it always makes a nice gift :DL

More information on the hardware you use would be helpful in trying to dig something up. Model names or numbers would be helpful, but I'm going to sleep now so wont have a chance to look into it till the time i wake up, but others here might.

The piano I have is a Korg SP-300. So far I have made the recordings with a Tevion MD 9780 MP3 player using a standard audio cable. The other thing I've tried was to connect the piano to the microphone inlet of my notebook and to record the signal using the recording function of EAC (Exact Audio Copy).
The minidisc player, a Sharp IM-DR420H, is a Net MD, but that just means you can copy MP3s onto the minidisc, not the other way round.
So far I've only made recordings using the MP3 player's built-in recording function, but as I've said, the drivers probably don't work anymore, and the quality was not that good.
What I'm basically looking for is either an MP3 player with a good line-in recording function or some advice how to achieve best results connecting my digitatl piano directly to the computer via audio cable.

Couldn't come up with anything useful, sorry.