Alan Cartwright is the only player Fritz didn't manage to capture: though he didn't realize for quite a while that the sound-desk picture included Keith Reid, who is not usually captured in fans' pictures.
More about PH orchestral gigs may be read here, and some related pictures (same stage-clothes even!) are on show here. Click on the pictures for some lateral surfing to related corners of 'Beyond the Pale' …
Gary Brooker in his faux-naval tail-coat
Concert-notes closely-modeled on the Rainbow programme
Superb shot of the great BJ in drums-centre position
Gaffa-tape holds the Leslie-switch in position
The choirboys float above orchestra and band
Gary, Barrie and Mick in full flight
A great view of Chris Copping's battered organ
Keith Reid meditates on the sound balance
That appears to be a young and hirsute Chris Thomas at the board. In fact, there appear to be two boards, which would make sense if there was an orchestra and choir. For October 1972 they look pretty damn sophisticated for live sound boards, so my best guess is that they are broadcast or mobile recording consoles that the Germans must have provided. The intercom mics on goosenecks would be appropriate for such boards, but wouldn't have much purpose on a live sound board, though in 1972 not too many people were making live sound boards so the requirements were a bit nebulous. Read Chris Michie's suite of BtP pages