I remember the bass going from a standard Jazz tone to all of a sudden that well defined bass growl and i believe he changed to an Aria for that album, possibly the SB1000. Quite a significant change of sound.
I once helped them in with their gear at our local venue probably circa 82 (owner let us in for free to the gig at night and a few free beers) Always thought they were an odd bunch. Catley came across as very vain and stand offish, Lowe couldn't see 3 ft in front of him on stage without his glasses and he wouldn't wear them live, drummer wouldn't let anyone touch his drum gear so he carried all his in on his own. The only decent one was Mark Stanway who was very pleasant guy and happy to chat with us. Also remember Stanway when he appeared with Grand Slam and again a nice guy altho Grand Slam were all great company with Phil playing pool with us in the bar even buying his share of the rounds. Its little moments like that when you get to see the real people behind the musicians.
Happy days Rob.
Dave