I agree with Sailor Steve - The gramophone can and does handle stereo music files. I convert mine to mono for the same reason he does.
Steve, if you want to make them crackly and more "authentic sounding" the only way I've found is to use Audacity on a track-by-track basis and change its EQ profile. Often a fairly straight line cutting bass and boosting treble can give an acceptable result. A quicker alternative is to use a sound-editor to mix a "hiss/crackle track" under each audio track. I've been known to use both.
It depends on the music you're using. If it's modern and recorded beautifully, there's more work involved in "antiquing" it than with tracks taken from older recordings which often, though cleaned-up, are still half-way there.
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