question about s4 mk2
So the s4 has a dedicate filter knob right, does this knob have a center detent and does it have positive stop when it reaches either extreme limits or does it just infinitely rotate?
It works just like an equalizer nob with a center notch, which will also also switch off the Filter at the center and automatically switch it on when off-center if you use the s4 in HID mode.
It has a detent and hard stops at both ends of it’s 270° travel.
thank you both for the info 
looks like its time to set the s2 aside and buy myself a s4. thanks again
so kinda late here but bought a s4 like it but I have a problem with the deck c button sticking, and not exactly happy with the solution offered by the seller. sorry all for this post because there is no reason for it other than for me to vent super late.