Right I wouldn't call that just intonation though, since pitches do not have a static fundamental frequency. I'd love to write a program that, given some midi,

Right I wouldn't call that just intonation though, since pitches do not have a static fundamental frequency. I'd love to write a program that, given some midi, finds the perfect such dynamic tuning. Then something else can either synthesize with that directly, or fake it with the pitch weel.