Green Lake Aqua Theatre, Seattle Poster

Hi All,
I was at this show as a member of the opening act Sanpaku. I am searching for tapes of that band, as all known recordings have been lost. (We played a bunch of shows with GD, we were also managed by Bill Graham in 1969) Can anyone point me to a source of GD board tapes, via Matthews, Cantor, etc. that might have included us. I have corresponded with Bear, who is not very cooperative. Cheers
Hewitt