hi Alison, I am of no help if you are wanting to record to mini disc but I would suggest that you could record straight to the laptop or a desktop using a free prog called audacity. It is a nice prog that allows you to capture and edit as well.
If the music is already on the computer all the better. You can have the music on one track and record voice to another then mix together
Hope someone can volunteer some info for mini disc recording. The only person I know who uses one isnt a member of this forum