ah ok, cuz my parents just got a new minidisc player, and what you can do is treat it like a CD-rw, where you connect it via USB and you can store data, mp3's without doing the playing thing like if you were recording off of a Stereo playing a cd which has a digital output for minidiscs. This is why I can't too clear, unless what you are saying is in fact what he is trying to do. Which does sound like it is.
This is what I found, on the subject. It seems promising, if everything goes as well as it is described. You need to recompile your kernel with USB support, like I mentioned before, and then an extra option which is the USB Audio will then become available. Just choose it, and I recommend you compile it into the kernel, and not make it into a module...then you don't have to worry about having to keep loading it.
Hope this helps!
"USB audio systems such as speakers normally comply with the
USB audio class specification. If your audio device does not comply with the specification, it will not work with Linux at this time.
You need to turn on the Sound card support kernel option, which is in the Sound section. You will then be able to turn on the USB Audio support option in the normal USB section.
If you elected to use modules, you need to load the module called audio.o.
You can test your installation by dumping some random data out to the audio interface, using a command like cat /bin/bash > /dev/dsp. USB audio is integrated into the normal Linux sound architecture, and most tools should work fine with USB speakers. See the Sound HOWTO for more details and suggestions."
This is the website so you can checkout the Howto:
ah, and remember that their example is Sound speakers...but you can just ignore that, just plug your usb cable and it is the cable that takes business of converting it into digital signal, for the minidisc to record it.