I have managed to find a link to the entire MIDI Tuning Standard spec on Microtonal Synthesis com, but frankly I'm getting well above my pay grade on the entirety of the structure. Looking at that spec it would appear too be either a subset or a stricter definition of the above-mentioned MIDI Tuning Standard.
I found this data guide from a Roland manual This is capable of adjusting each of the 12 notes in any octave by cent steps, but is repeated the same for each octave. The Raw spec is available from the MIDI Association : Universal System Exclusive Messages & there is a Wikipedia article on it : MIDI Tuning Standardįurther research would appear to show that some instruments - specifically Yamaha, that's where I used to work so still have people I can ask, but a Google search shows some Roland devices as also being capable - use Scale/Octave Tuning Adjust from the GM2 General MIDI 2 spec.
I have never personally used either of these, though I knew of their existence - so some further research may be required to see exactly how they are implemented. There is provision in the MIDI Standard to send & receive microtuning, both as entire data dumps & some realtime modifications, using SysEx messages.ħEH 08 nn is MIDI Tuning Standard (Non-Real Time) &ħFH 08 nn is MIDI Tuning Standard (Real Time)
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