Been thinking on Direct/Merged profiling lately, along with the need of a direct box for Direct Amp Profile creation. Some amps, such as a Mesa MkIII, have a direct or slave out. It is basically a tap on the speaker lead that has attenuation and output level control to allow the amp speaker output to be run directly to rack mount equipment or additional amp inputs.
I can't think of a single reason why this type output cannot be connected directly to the Return jack of a Kemper and used in place of a direct box for the Direct Amp Profile process. Of course the output of the amp must have enough attenuation to be within the Kemper's Return jack signal range.
Has anyone tried this method for Direct Amp Profiles, if their amp has such an output? There might be some gotcha that I have missed. It might give far better results than say a less expensive direct box.