In my opinion, it is futile to wait for drastic microtonal
implementations to occur in Sibelius or Finale. There is a realistic
option for microtonalists using such notation software in Apple
computers: "Scordatura" from H-Pi Instruments, programmed by Aaron
Andrew Hunt.
While still in the process of beta testing, this soundfont synth with
custom control surface designs can simultaneously map any number
of .csv tuning tables to a total of 16 ports x 16 patches and playback
microtones thru soundfonts.
Integration of Scordatura with other midi programs is quite simple.
Just assign the appropriate Scordatura virtual midi input port in
Sibelius or Finale, choose the type of virtual port: "Master" (one
synth, 16 channels) or "Multi" (16 synths per 16 channels), configure
each port's 16 channels to accomodate instrument patch groups for your
orchestration needs, load the tuning tables you desire for the patch
groups and go!
It is as easy as doodle to switch on the fly a tuning table using
silent trigger notes. These trigger notes can be placed at the highest
or lowest registers and hidden in Sibelius or Finale.
Ability to save configurations assures that you don't have to worry
about your microtonal settings for a particular composition.
Scordatura is a marvelous and promising new microtonal tool for tuning
adventurers and xenharmonic composers.
Check it out:
http://www.h-pi.com/SCRDsoftware.html
Dr. Ozan Yarman