Well after moving my rubbers around on the keyboard I realised that the problem was the pcb keyboard pads not the rubbers. I initially cleaned them with alcohol. After going back over them all with an eraser ALL my keys work. Super!
I still have to work out what is happening with my effect. All of them work however the speed potentiometer works like a volume at the same time, e.g. no sound until about 11 o clock then the volume and speed begin to increase. On the 'no effect' setting it acts as a volume. If anyone has any thoughts? My battery leak did get up onto this board, but all other functions seen to be working correctly
Once again thanks everyone for helping out. So great to have the assistance, keeping the polysix alive!