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Some years ago someone claimed that a friend of his had taped the Amsterdam rehearsals. According to him the quality of the tape was quite bad.
On the other hand there is Dandelion / Rattlesnake who were about to release the sessions around 2000 or 2001 if I remember correctly. Until now nothing but Can't You Hear Me Knocking has been released from them.
I think even the bad quality tape would be very interesting for most of us here.