I reached out again to the owner of the tapes etc., this morning. He was in France and is returning next week and said he'll call me when he returns. 

Until today I've never seen the rack of tapes photo. Without revealing  the identity of the super fan and acquaintance of Brian, Carl, Mike and Al, I can definitely affirm that the owner knew the boys very well. Besides playing golf and socializing with him, I sold the fan his basement Tascam pro-audio "toys" while I was in sales etc. for Audio King in Edina Minnesota.  A special patch bay for the gear was also built by an AK specialist. Mr. Rolle was an outside contractor for AK and sold him various McIntosh electronics along with Altec VOTT and a Revox deck, I believe. I can not divulge the name of the fan as he hasn't responded to phone messages left for him. We have common friends who have also recommended that he remain anonymous. I know that this doesn't help in the discovery mode. But if the situation changes in the future for any reason, I will post again.

I live in St Paul. In the 70s I knew a friend of the BB who had a monster basement sound system that I sold him along with a dude named Bob Rolle. I'll try to contact the friend  and post more depending on his privacy concerns.