Reply to A little bit of vdj mapping help needed and a few questions to be answered

hey guys, i started trying to map and learn these things for myself months ago, real life problems happened and learning about djing + stuff took a backseat , now things are almost back to normaility ive decided to give it another shot, but cant seem to remember much of the stuff i had been trying to learn to do myself before , so i came here in search of some kind soul please help me find the solution to these problems and help me out with the mapping .

( i use Virtual dj pro 7.3 on windows os + the Reloop Terminal Mix 4 as a controller with the nothing changed on the basic mapping that comes with it )

Question 1 : which vu meter do a pay attention to? -
whilst mixing, i notice the vu meter on my controller is showing different levels to the vu's displayed in virtual dj, i believe that this is due to the tm4 only showing the main output vu, but does that mean i only pay attention to the vu on my controller, and not worry about individual deck vu's clipping and such or pay attention to both the controller and every individual deck vu and stop clipping on all, or make sure that every vu for each deck playing is not clipping and ignore the vu on the controller?

Question 2 : Virtual dj default parametic equalizer -
The equalizer recieved the update in 7.3 meaning you can set the frequency bands for each knob to control, i have read a few threads on this and totally understand what frequencys to set for each and differences between different settings and how it works etc, but i understand there were also vsts that were far more preferable to vdjs default equalizer before this update, does the update make these vsts useless/not worth getting, or are there vst equalizers that are still better than vdj's new default parametric one ?

Question 3 : Mapping for multiple parameters for one effect knob -
For example, in the tm4 there are 3 fx buttons and knobs on each side, i use fx button 1 to turn on rollit, i then turn the knob but this only affects the first slider, i want it to control both the first slider and the second slider at the same time, heres is the current mapping for it : KEY: FX1_LEFT ACTION : deck left effect 1 slider 1 ( i select the effects through the reloop tm4 skin )

Question 4 : Map to make cue and cup buttons to behave like this ? -
i would like the cue button, if possible, to, whilst a song is playing, create a cue whenever i press it , if i press it again it will then delete the cue/hotcue made previously and move that cue to the point of where i just pressed, enabling me to let me smash the cue button as it comes up to a drop for example, then when im happy its in the right place, use the cup button which happens to be next to the cue button on my controller to play the song from the cuepoint i just set.

Question 5 : Linear Vs Quadratic line fader -
ive tried to find as much as i can to help me understand this, but im still a little confused, i understand that quadratic is supposed to be better, yet i have found nowhere that tells me what , if any, difference it makes?

Thank so much in advance for your time, help + knowledge, it is very very much appreciated! <3