Thanks for the reply, think I've got it sussed now, although the wiring from Master Crossover #2 looks the wrong way round. So if I have this right:
- presumably there are only 2 points that are controlled directly, the two masters, with each slave replicating its master
- when Crossover #1 is set for the diagonal, S2-R and S2-C on Master #1 are connected, this joins PBS-C and PBS-R on Master and Slave 2 so sets these two points to be straight head
- when Crossover #2 is set for the diagonal, S2-R and S2-C on Master #2 are connected, this joins PBS-C and PBS-R on Master and Slave 1 so sets them to be straight head - but I would think to be straight ahead and therefore "left", this should read: when Crossover #2 is set for the diagonal, S2-L and S2-C on Master #2 are connected, this joins PBS-C and PBS-L on Master and Slave 1
Sound about right?