I have a stack of discs of my music recorded live from a while back.. Some of them play, a bunch read blank and the largest pile don't playback at all. These ones read that tracks exist but when I push play the display reads LP: at the top and below that the track number and time. The track looks like it is playing as the clock is counting down the time played but nothing out of the speakers.. I am running analog out>amp>speakers Will these units play the LP format. The discs were recorded on a Sony Minidisc Walkman Thanks.