[x3d-public] v4 Sound > Analyser node > x3dom > who's drawing?

[GPU Group]

https://medialab.hmu.gr/minipages/x3domAudio/SpatialSoundFilter.xhtml
Q. where  / what function / who is drawing the Analyser node frequency or
time domain visualization. I don't see anything in Page Source looking at
Analyser node fields for output.

Thanks, Doug
more..
https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API/Visualizations_with_Web_Audio_API

- web audio example of visualization using Analyser node gets a buffer of
spatial or time-domain data on each draw loop, and draws it.
Currently web3d Analyser node has no output fields defined for the spatial
or time-domain output data.

https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/components/sound.html#Analyser
 It is a mystery to me how we would use it to visualize without access to
the data.
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