I came up with this a few years ago, using plot and a [line] as a bang firing delay to update the array, not ideal, but an interesting vanilla option. It peters out when the [line] has completed requiring another click.
slider-line-2.pd

@Martinukai Hi,
assuming x y and z output 1 when in range, testing for all 3 like this would work
bang-when-3-are-true.pd

@toxonic Hi,
-x is a flag to disable mouse actions for [filledpolygon]
So [filledpolygon -x 0 pointercol pthck cx cy px py] will do the trick, in fact as you are not using the mouse actions from the struct, you should use the flag for all your filledpolygon objects. Check the help for "filledpolygon" or "drawpolygon" for more options.

@ingox just brilliant!
A beautifully rendered patch that makes my patch look awkward, you have a real knack of simplifying the difficult stuff and solving too

@ingox unfortunately it also baffles me, I struggle along trial and error fashion until it works following the help in "/doc/4.data.structures/09.scaling.pd" which is not really helpful.
You can scale the pad using dynamic patching
here is your controlsurface-mod.pd with scaling
pad.pd

Edit: No it does not work properly but I'm sure it can - working on it

@toxonic You may get some insight into using the hotspot without a pointer with this offering I uploaded a few years ago,
https://forum.pdpatchrepo.info/uploads/files/1498974324729-xydrag.zip
The template is a little confronting but shows that by using just one xy pair (px and py) multiple nodes can be created using scaling and constraining (eg px(-100:100)(20:20) py(-100:100)(-20:-20)).
the x and y output from the grid is interpreted as greater or smaller than the previous which activates a plus or minus counter for the output values

@ingox said:

@toxonic Is it possible that you are using @Balwyn's xy-patch .

Not Guilty

@toxonic just multiplying the outputs by 0.01 gives the same result

Hi
Somewhere around Pd 0.47.0 and onwards Its been possible to send colour data using hexadecimal values for RGB to GUI objects. I found this very useful with dynamic object creation because the format is neater and more intuitive with a # symbol followed by 3x8bit hex values (eg #ff80ff pink).
Drawbacks, not compatible with Purr Data or Pd-Extended. The value is still converted to decimal in the pd file

gui-hex-colour.pd

or maybe

and here is yet another way, using [sgn~] and [avg~] in a subpatch to determine whether the dsp is on and [switch~] to disable the audio use after the notification
dsp-check.pd