[dawhead]

OK, lets take it clause by clause:

"Traditional DAW mixers were designed by companies with no pedigree in music mixing,

I'm not a deep historian of the audio tech industry, but I believe this is true. The majority of the original designers, developers and managers at Digidesign, Steinberg, Cakewalk, Emagic, Magix etc did not come from the world of music mixing (they were almost all programmers with an interest in music and audio technology - great people too). And its certainly true that the companies they founded had no pedigree in music mixing, certainly at the time that the basic design of their DAWs took place. True or false?

and they suffer from well-known flaws.

Ben has already explained previously precisely what kind of flaws he's referring to. Do you believe that his list of issues with existing DAWs is wrong?

Harrison eliminated these flaws in Mixbus by completely replacing the DAW's internal mixing engine and applying proprietary True Analog processing.

We could quibble with the first use of the "the" in the above sentence, but I can vouch for the fact that they certainly did replace "a" DAW's internal mixing engine (Ardour's) with one entirely built around their own digital implementation of their own DSP. Did you also notice how it said "mixing engine". The word "summing" is nowhere to be found. I can also vouch for the fact that the structure of the mixing engine they added differs in some significant ways from what happens in several other DAWs that I happen to know some internal details about. Harrison are not going to tell you precisely how, so you can either use it and listen to the results, or you can do null tests on it if you believe that such testing reveals much. Your call.

Harrison consoles are known for their great-sounding EQ, filters, dynamics, and bus summing on every track

Seems reasonably well established. Do you disagree?

Now Mixbus offers every engineer a real Harrison music console "in the box"."

I guess one could debate what a "real Harrison music console" is. My impression is that most MixBus users have been quite satisfied with whatever extent MixBux provides a "real Harrison music console", even if the control surface and data display experience is quite different.

Now we're back to your text:

They suggest other DAWs suffer from flaws that Harrison eliminated by "replacing the DAW's internal mixing engine and applying proprietary True Analog processing." That's complete hogwash. As my tests have shown, their "internal mixing engine" does the exact same job as that of other DAWs.

No, you showed that you could get MixBus to null with Logic. You haven't refuted:

1. that they replaced the internal mixing engine (of Ardour, which is pretty typical of other DAWs)
2. that they replaced it with their own DSP
3. that it can produce different results than the mixing engine in other DAWs

You just showed that with a particular combination of settings and a given input signal, it nulled with Logic, which as has been explained over and over is a highly desirable and utterly expected result.