I've been playing with it : merge a cab from 3.0 merged profiles with a studio profile and mix the two
Here is the official doc :
♦ Merging Studio Profiles and Direct Amp Profiles
In case you were wondering, Direct Amp Profiles can be merged seamlessly with Cabinets of Studio Profiles into a single Profile containing the sound of both. To do this, create a Direct Amp Profile (without cabinet) and a Studio Profile (with cabinet and microphone) of the same reference amplifier and store them separately. It’s good practice to keep all settings of the reference amplifier exactly the same for both Profiles, to yield as authentic a result as possible. Both Profiles can then be merged by copying the Cabinet of the Studio Profile into the Direct Amp Profile and press the soft button “Merge Cabinet”.
Here’s the procedure in detail:
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Select the Studio Profile in Browse Mode.
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Hold the CABINET button for at least one second until it’s in focus.
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Press the COPY button on the Front Panel.
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Press EXIT and select the respective Direct Amp Profile.
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Hold CABINET again until it’s in focus.
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Press the PASTE button.
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“Merge Cabinet” will appear under soft button 2. Push it!
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Press EXIT and store your new Profile.
Your Merged Profile now features the authentic “amp with cabinet” sound of the Studio Profile, whenever the Cabinet Module is active. If you switch off the Cabinet Module, you will get the authentic, “amp only” sound of the Direct Amp Profile to be fed into a physical guitar cabinet. The original Direct Amp and Studio Profiles are now fully contained in the Merged Profile, so you are safe to delete them now, if desired.
A positive side-effect is that the Cabinet of the Studio Profile has become an “authentic” cabinet, comparable to one based on an imported impulse response. If you copy a “merged” Cabinet Profile such as this into another Studio Profile later on, it will not undergo the usual approximation of the CabDriver algorithm.
Note: the soft button “Merge Cabinet” always appears if the Cabinet of a Studio Profile is copied into a Direct Amp Profile. It will not appear under different conditions.
Note: when you have created both a Direct Amp and a Studio Profile of the same amp with settings unchanged, you might still notice that the values for “Amp Gain” and “Amp Definition” differ a bit. Don’t worry - this has no impact on the sound.