it is lossy, but not mp3 it is minidisc (atrac). compare with the screencaps further down
this thread.
atrac minidisc recordings are acceptable for trading so long as they were made that way by the taper at the venue. so if it is a 1992 or later aud recording it was most probably taped on an MD deck by the taper and is acceptable for trade. If its a 1977 show, well, that's very bad news.
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