Even if it is an Audio track, the volume Nodes show in the Event Editor as MIDI.
Go figger .. PGMusic products are MIDI based at their core in my experience.
So I expect it there.
This is the biggest reason that using the Resolution setting in RB is huge (something I say many times but it seems like many users don't get it). Audio Edits, Nodes, MIDI Events; everything becomes more accurate if you adjust Resolution to the max. (Edit-Resolution)


Historically there was a version or three where the audio event triggers were actually displayed in the same window (triggering separate audio events, like after doing edits or recording/generating different sections), but not recently.
I'd prefer to still see them, but I mentioned it once in this forum and it quickly disappeared (not the post, but rather this 'feature') .. at least in my eyes it was a feature.

The image below shows an example of the 1st paragraph above

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.. I do not work here, but the benefits are still awesome