Yes, and I have read three time the core message: "it would make the workflow easier", which is not enough information for me.
I have spelled out repeatedly why it's an issue, who it applies to, detailed a rather clumsy workaround, suggested how to improve it and where in the system to put the improvement. I really don't know what more information I can give you.
But this would cause the A/B comparison to fail, as you change the environmental sound, everytime you switch back and forth. Then the reason for the failure would not be obvious for less skilled users. Please take this into consideration.
Maybe make users respond to a dialog box when they switch the option on, warning them that they will be comparing the sound of a miked amp with the natural sound of an unmiked amp-in-a-room and to expect differences? (Accept/Cancel)
I have plans for an option to mute the direct out, when you leave the profiling mode and go back to the browser mode, then the profile can be heard without the reference amp playing along. Would you like that?
Sure, but that would only fix half the problem.