ØSkald
Isn't this exactly what's needed to implement this?
MIDI Tuning Standard (MTS) is a specification of precise musical pitch agreed to by the MIDI Manufacturers Association in the MIDI protocol. MTS allows for both a bulk tuning dump message, giving a tuning for each of 128 notes, and a tuning message for individual notes as they are played.
https://en.wikipedia.org/wiki/MIDI_tuning_standard
I guess it would be, however the issue is that most MIDI gear does not implement this.
The vast majority of my MIDI gear uses a SYSEX message to set global tuning. We cant expect Cakewalk to implement a separate SYSEX message for each and every bit of gear out there, although I guess it could be done as an extension to the .ins format.
But VSTi's are arguably the main issue. There's no standard tuning parameter at all for VSTi's. Some may not even support a global tuning. instead relying on you tuning each individual oscillator. Not only that, even if you did know what the parameter was, you'd need some sort of mapping between Hz and the numerical value to send - you can bet they'll all be different.