Let's solve an FX loop puzzle!!
here is what we basically concluded that you can do with an LS-2 anyway:
Bass -> GR in
GR Effects Loop Send -> pedals (you want inside the loop) in
pedals out -> LS-2 Input
LS-2 Loop A Send -> GR Effects Loop Receive
GR Out -> LS-2 Loop A Receive
-> Amp
Have the LS-2 on mode "A <-> bypass". Leave the Groove Regulator on all the time and use the LS-2 as the switch (to activate and deactivate the GR). Simply use the other pedals inside the loop as you normally would, using the switch on the pedals.
I think that's pretty much it. I might have forgotten something, if so just look on the other thread.