The testing is going quite well, I just thought I would post an update. I originally had the circuit running on 4JRC4558 as they were the only ones I had laying around. I changed them over for TL072 and the whole thing stops working! The best I can seem to do is have 3 TL072 and retain one 4558. Seems very odd but the ticking got slightly better. Im thinking about trying a TL022 in the place of the power isolator as it is supposed to suck less juice. Maybe worth a try. I have been reading up on the old posts about ticking and tried putting a large value cap (220uF) between the Vref from the op amp and ground. This reduced the tick considerably. I will try out some more values and see how I get on. But at the moment these too options seem the best for reducing the tick without rebuilding the board! I think it will be fine for all but the fussiest of players but considering it was my first ever layout Im pretty pleased. Im getting my pignose out of storage tonight so will start testing out all of the panning and phase switch stuff to do the final tests.
Cheers for all of the support, hopefully it should be up as a project file within a few weeks