I've never understood why people try to get the "smooth" jump. The "smooth" part actually comes from your player not being synchronized correctly (that's where pmove_fixed / pmove_msec's come to play). You can perform the same jumps without introducing "ambiguity" with fucking around with pmove, just that your jumps will not look like you "glide" off a surface.
But to answer your question, pmove_fixed is just 0-1 cvar. It's pmove_msec which controls it. pmove_msec is usually tied with your FPS, if you alter it with pmove_fixed, you introduce "out-of-synch" prediction, which causes this weird gliding effect.
So if you want to test it out, set your fps to a value which is not synchronized with the msec in which pmove should run. pmove_msec without tampering is calculated based on your FPS - pmove_msec = 1000 / fps. So at 125 FPS, your pmove_msec will be 8. Try out for example with FPS 125 and setting msecs to 10.