no worries! 4cm is 4 cable method. It basically means using a multi fx unit that has an effects loop that you would use with your bogner amp or Kemper in a way the makes it so your before preamp effects first , and your time based and modulation effects, after, in the amp or Kempers fx loop post preamp stack.
Weird thing happening with helix and kpa...
Ah. Been doing the 4cm since I think way back to the Roland GP8. Just didn't recognize that shorthand for it. Until recently, I was using an M13 that way with my Ecstasy. Since I got the Kemper, I sold that M13. Still liked it, just figured I might as well get rid of it before it depreciated any further. Now when I run my Bogner, I just use a traditional pedal board with all the basic needs including 4 gain stages.