Osaka 71 Aud. vs Sbd? in Led Zep Live Posted September 6, 2010 I have a theory, and I think this tape is a monitor mix recording. There is one of the Landover show in 5-26-1977 and I have both the soundboard and the monitor mix. The monitor mix of this show in particular has a lot in common with the "Soudboard Tape" of Japan 1971. I say this is a monitor mix tape.