Caustic Song file (optional):
Okay first off you need to use a side chain of mod synths doesn't matter the initial preset. (Initial preset being the one that makes the sound in the first place)
Use these effects in your side chain:
Flanger
Cab sim
Bitcrush and/or distortion
Auto wah
Chorus
Band pass/ band pass isolate
I suggest you put the chorus last. But you can put it in the middle and one last in the chain. And everone these don't need to be in a particular order. It will depend on what the regular signal sounds like.
Always use:
Distortion or bitcrush
Cabinet simulator ( this one especially, because it helps with the robot like sounds)
Band pass/band pass isolate
Auto wah
Flanger is optional
Set CabSim's Width and Depth settings to low or lowest for deep metallic robot character