Music Discs should sound slightly grainy

I don't want the music itself to sound grainy but there should be a grainy effect applied to the music on the discs ingame. As the new music discs sound too "Clean" for being in old structures, who knows how many years or decades old.

It shouldn't overpower the song though and should be only slightly noticeable.

This should go probably for all discs but I'm mainly talking about the main ones, Relic, Pigstep, Otherside, And the 3 in 1.21.