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well, it works on playback, only that on audio export that it is not there, and maybe never will, sorry for that.

in fact, this is not a new issue at all: the often suggested workaround is about inserting a plain audio_fx amp plugin right _after_ the MIDI instrument plugin and automate that instead of MIDI track volume (or panning), which as said only sends CC#7 (CC#10) through the plugin chain and actually depends on the instrument implementation wrt. MIDI channel volume (or panning) controllers.

try that; you won't regret :)
cheers