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take this [cubic approach] for the VU values also, to save some time?
yep, maybe, however the IEC (logarithmic) functions must be retained nevertheless, as the dB values have to be displayed and converted still (think of audio gain spin-boxes entry value...).

open a session, all the controllers should be sent out?
what, aren't they? it should be sending all feedback controllers on session load, for every session track eg. look for qtractorMidiControl::sendAllControllers() usage in qtractorMainForm.cpp ... if that isn't really effective please do complain (works for me might not be enough;)

Cheers