I was referring to an instantaneous shift in velocity of 1:1.005
Well you'll have to be more precise then if you want to help me understand. What you have described is just too vague for me to follow which is why I gave a specifc example with specific frequencies with a hypothetical result.
FWIW- We don't hear "instantaneous shifts in velocity" - we hear sound vibrations or oscillations which is why I tried to boil things down to frequencies and power that would result from IMD distortion from two frequencies passing through a non-linear amplifier. (non-linear meaning that the signal gets amplified differently depending on its level)
BTW an "instantaneous shift in velocity" would cause a sharp discontinuity in what is normally a smooth waveform - it would necessarily contain lots of high frequencies and not 1005 Hz. This is a fundamental fact from mathematics.