Probably stating the obvious about the current MIDI Standard - as I recall the current Standard does not allow an interval smaller than unity between each pitch value. Sooner or later there will be agreement reached about the acceptable musical pitches for quarter tone music in its myriad of modes. How developers handle this is beyond the view of my crystal ball. Is it likely that the MIDI Standard will ever be revised to handle intervals (of varying sizes) less than a semi-tone?

I'm quite ABC-centric these days. There is already one experimental project that employs unofficial ABC syntax for quarter tones, plus some mods made to abc2ps (or is it abcm2ps?) to print unique note symbols. The problem remains of accurately playing a quarter tone tune using MIDI for some of the reasons mentioned above.

Back on the subject of Whistle Fonts. Today I wrote the kernel of a little Excel utility which allows you to copy in the notes as text, and then it gives you the Whistle TAB as a series of X and O in vertical stacks for each hole. There's no need for a special font of course, just a lookup table for each note in the scale. Nothin' fancy, but it works.

Regards, John