I saw your tags so I googled your name. Impressive. I am honored to meet you!
Thank you for your work! And I mean that wholeheartedly. Best wishes!
Thank's, no need to go overboard
There are subtleties in instrumentation amplifiers in how they handle the common mode signal. Some folks don't consider it a "true" instrumentation amplifier unless the common mode voltage is rejected at the input and no internal circuitry sees it, such as in a current transfer style IA. In audio there are not too many applications with a huge common mode input voltage.
IIRC the Sumo 9 used an unusual version. If you think about it using a differential input single ended with the other input grounded creates a differential output with a small common mode term. By using a different gain in the plus and minus path you can make the amplifier have a truly differential output with no common mode component.
EDIT - The Wiki is pretty bad on this, instrumentation amplifiers are not almost always made with three op-amps. The Demrow data amplifier was (as far as we could trace) first published in 1968 and certainly dates from earlier. It is the grandfather of all "current feedback" IA's and virtually none of the IC IA's currently in production are based on three op-amps and a resistor network.