I'm still trying to wrap my head around the way the Direct Amp / Merged Profile thing works. I get that the DA profile has no cab, and that the studio profile contains the influence of the cab and mic, but here is where it gets fuzzy for me. It has been said many times that when the cab is copied from a studio profile, it is not as accurate as it could be because the profiler doesn't have enough information to accurately split it apart. I assume the Direct Amp profile has the needed information, since if you added an accurate cab to it you should get the studio profile. You can think of this as A + B = C. Solve for B and you get B = C - A (or cab = studio profile - direct amp). Yet when you create a merged profile, this is not the process. Instead, according to the 3.0 profiling guide, you copy and past the cab from the studio profile into the direct profile and press merge. But we already concluded that the studio cab was inaccurate, so something is not adding up. I'm guessing that there is some reference cab and that the merge process compares the direct amp to that reference in order to correct the inaccuracy in the studio cab. This would result in a change to the studio cab. So my question has to do with where that change (or delta) is stored. If I copy a studio cab and save it as CabPreset1, then I apply that cab to a direct amp, hit merge, and then save that cab to CabPreset2, are CabPreset1 and CabPreset2 the same?
The reason I ask is because I'm curious about the validity of pulling cabs from studio profiles generated before 2.8 to merge with a 3.0.2 direct amp.