The best idea (which YogzDaBeatChild already said) would be taking it trough analog tape. If you don't have big tape recorder (magnetophon), you can use normal casette deck. C-casette has kick-ass compression by the way.. let it clip a bit and aaaaaahhhh!
But those tape recorders aren't so hard to get. I got mine from a fleamarket. Double-check that it works, though. Looks like this:
