It would be fun to hear him live but these recordings are not my cup of tea. He speaks so clearly and sincerely and I like his talking a lot. Circular breathing changes the acoustics of playing because the lungs and other air chambers are not used during sound making, only the mouth cavity. I've done it for years but do not find much use for it. Yes, I heard Roland Kirk live and was astounded by his playing and his swinging, with a lot of his hardware held on with masking tape. At the bar between sets, he seemed unapproachable.
These old Conns and Bueschers, as well, could benefit from adding a bis key.