I think you could export each plot to a separate text file then read each file into a separate graph array which can have a different colour and stacked on top of each other (the four arrays could also be sent to same graph if preferred).
Or create another column in the spreadsheet to give the coordintates a plot identity which can be used to filter the xy pairs.

Requires else and iemguts libs

Edit:
And here are the files
racing.zip

the-race.zip
requires the following libraries: else and iemguts.

@atux I refer you to this thread
https://forum.pdpatchrepo.info/topic/14831/soundfont2-sf2-preset-reader/20
and the second last post where I uploaded sf2-toy.zip.
Mod-Env-Pitch(7) slider allows pitch change of the playing notes
you may need to extend release times and shorten the other envelope parameters.
however I had omitted some files, so here it is again with all the bits
toy.zip

@impression
Sending the polyphonic note data directly to clone via send a receives to clone and receiving from the right node (rejected) of route in the synth works ok, So yes its possible.
testPage-updated.zip

give testSynthClone a unique argument $0-three
in testSynthClone put [r in-$1]
in testPD put
[ s in-$0-three]
|
[all cutoff $1(
|
[clone testSynth 4]

testPD.zip

You can prefix the number of the cloned synth in a message to that synth eg 2 cutoff $1 then within the cloned synth and route the cutoff value and pass it on polyphonically with all cutoff $1
clone-project.zip

Damn too late again

I've just updated the above poly-dynamic to pass through the clear and stop messages to poly

I never found a way to change the number of voices in the poly object other than changing the creation argument. eg [poly 8 1] to [poly 1 1]
Here is an abstraction to address this

poly-dynamic.zip updated