Two tracks. That's it. Hiza no Ue no Partner, the Kitty on Your Lap PC version from 1998, included this appendix CD as bonus material and kept things minimal. Track 1 and Track 2 are listed without proper names, which gives the whole thing a demo-tape, archival quality.
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Given the era and the Windows platform, expect late 90s visual novel BGM, soft synths and light melodies built for quiet character moments. It's the kind of release that only exists because someone at the publisher said "throw in an extra disc."
And honestly those are sometimes the most interesting finds. If you're already deep in the Kitty on Your Lap rabbit hole, you might as well hear everything.