So then basically, if we are not profiling, we don't press the merge button at all. Correct? Then you are saying we can't get a 100% authentic sound if it wasn't already profiled by someone? In my previous example, by not pressing the "Merged" button the Fender amp and Marshall cab sound close but not authentic?
As has already been mentioned, only the original author of both the Direct Amp profile and matching Studio profile should be using the Merge function.
Merged Profile = DA (Direct Amp) profile + Studio Profile.
Creating a Merged profile is a 2-step operation, and is performed by the original author of the profile. First, a Direct Amp profile is taken (no mic). Then, without making any changes to the reference amp settings, a studio profile is taken (with mic'd cabinet).
The KPA now has information on the Amp, as well as the Amp + Cabinet combination. Upon initiating the Merge process, the KPA authentically recognizes precisely what part of the profile is a contribution of the Amp and what is the contribution of the Cab.
The KPA can now accurately subtract out the "Cab" portion of the Merged Profile. An example of such a scenario is when someone is using this Merged profile, and wants to use only the DA part of the profile to send to a physical guitar cab, while sending the full studio profile (with Cab) to the mixer and Front of House.
Cheers,
John