the reason is because you need a method of detecting velocity first
before you can correct it - and then you have to do it in real time
(without any delay).
Although I find much of this amusing, I do agree that speed is important. Our amps don't sound like tube amps partially because they are so fast; there are very few solid state amps that are as fast as our amps. In that way our tube amps differ quite a lot from the vast majority of tube amps.
As I understand it Roger, you have a means of detecting this 'velocity' but what I found peculiar last time I engaged in this topic was that you had not quantified this velocity as a specification. I'm pretty sure you're not talking about risetime/slew rate.