This may help I use 2 variax guitars a 700 and a 300 fitted with a Roland midi pickup for use with a GR 33
I use 2 Line 6 AB switches to power the guitars and each outputs which would normally go back to the amp I put into a Fender ABY box true bypass which allows me to select A or B with 1 cable back to the rack mounted pod
This works fine with no popping or clicks when selecting the guitar
I now need 2 additional guitars for live work with my band Godin xtsa and a custom MacSwain with bareknuckle pups Fernades Sustainer and Kaos pad and looking at using a second Fender ABY foot switch for the second pair of guitars and each output of the ABY 1 & 2 into a 3rd Fender ABY switch which will mean only 1 cable back to the pod
I am completing this stage at the moment and should have it finished by the weekend anyone interested in the final result let me know and although the board is a monster it allows me to set up in less than 5 mins instead of 25 as it is all pre-wired and just need 1 240 volt power lead a cable to the pod and a cable to the PA for the Roland