if you want to use the g-force with both amps, do it like this:
split the signal with the buffer. use buffer out and tuner out to send the signal to the inputs of both amps.
loop 5 input gets the signal from the send-out of amp A and loop 5 return gets the signal from send-out of amp B.
loop 5 output goes to input of loop 7 (your g-force) loop 7 out goes to loop 6 input
loop 6 send goes to amp B return jack and loop 6 out goes to amp A return jack
you´ll need a "shorted plug" in the return jack of loop 6!
when loop 5+6 is deactivated, your signal runs thru amp A
by activation loop 5+6, your signal is running thru amp B
by turning loop 7 on/off you can switch in/out your g-force
there are CC# for turning on two loops at a time. i do it like this at the moment.
note:
due to the reason, that the buffer and tuner out (both deliver the same signal) is not isolated from each other, you´ll get grounding hum!
use a line-isolator/transformer to stop this awful noise, e.g. from palmer or ebtech or lehle