I had both of these on lp and sold them to finance my AEC box - I made cdrs of the vinyl and wonder if this issue is derived from "needle drops". FWIW, my discs combined time out over 80 minutes.
I discovered the tape while preparing the cd reissue of the '60s AACM series for Delmark. The first couple of minutes are "warming up" but the rest is fascinating. I sent a copy to Muhal's wife. Rights have not been cleared.