Concerning the LP's, you used to be able to purchase a separate 'record player' that had line out sockets (left and right) and they were also both connected to a pre - amp which gave full volume output at line level. I think it was ARGOS who sold them, I'm sure there are others and you would just connect it to the line in on your soundcard, obviously you'd need a convertor plug to connect to the soundcard (3.5mm stereo). Software could range from Audacity up to the likes of Audition to remove the crackling.

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