FrenchSky, there is slow motion function (if I understand what you mean correctly) on the Foxsat HDR.
It is the button on the right second row from the bottom.
see pic here
While a recording (or even while watching live TV) is playing back, you press on this button and the playback slows down to 1/2 speed, press again for 1/4 speed, press again for 1/8 speed and again to go back to normal speed.
I don't have either of the newer models but I seem to remember reading that this function is not available on these.
PIngu