I currently use each of these three guitar preamps (ada mp-1, marshall jmp-1, mesa triaxis) thru it’s own snd/rtn fx loop (all set to instrument). This way they are all accessible in the chain and i can change patches with a midi controller. All this works just fine, all fx of the helix are where they need to be (before or after the preamp) while the Main out of the helix goes in mesa 2:90. Again, this setup works fine but I find the preamps to all sound rather thin compared to a standard full amp in 4cm. Maybe has to do with ada conversion of the preamps thru the fx loop?
Does anyone else use multi external preamps but hooked up in a different way and get fatter sound?
the idea is to be able to use the helix as multi fx with all three preamps