understanding speed step CVs 67-94 28/128 speed steps

I believe you are confusing two different scenarios. CVS 67 and 68 are a part of CV29 and have nothing to do with the speed steps 28 or 128. To understand CVs67 through 94 study CV29.

Understanding the motor controlling CVs is too involved in a short thread in my opinion and should be explored in articles and you tube videos. Speed steps are simply dividing your overall max speed by 14/28/128 steps. You can also change the increments of each speed step.

I believe you are confusing two different scenarios. CVS 67 and 68 are a part of CV29 and have nothing to do with the speed steps 28 or 128. To understand CVs67 through 94 study CV29.

I might be confused, but I thought (assuming CV29 bit1 is on) if I crank CV67 to a very high number then my train will go faster when I'm at speed step 1.  Am I wrong about that?  If that is the case, its really clear how these 28 speed matching CVs (67-94) correspond when decoders were all 28 step, but a little murkier now that all decoders are 128 step (particularly since 126 does not divide evenly into 128).  I imagine they interpolate, but I'm hoping to understand that interpolation better.   I know "Google it and research the topic" is the best way to learn (which I will), but I was hoping someone would have some insight.

I found an interesting discussion here:  https://cs.trains.com/mrr/f/744/p/296708/3469241.aspx

CV2 is for motor starting voltage. CV3 is for acceleration delay,CV4 is for de acceleration speed. CV5 and CV6 are your speed curves. Each manufacturer of the decoders will enable different CVs. I use air wire and they have a motor bump and a motor bump duration. Being new i suggest you don’t use the speed curve from CV29 and use CVs 2,3,4,5, 6 plus any motor control CVs. That’s what I do and find that’s enough motor control

Although I don’t use CV67-94 my understanding that it is a speed curve and not speed steps. Some decoders also have 14 speed steps