Yes, Finale non-standard key signatures are limited to 15 accidentals:
from -7 to +7, including 0 (i.e. a natural). In my own microtonal music,
using a range from 9 to 31 or so tones/octave, I have never had to use
more accidentals than that, but it seems to me to be an arbitrary
limitation and increasing the number ought to be on the request list
(alongside my old favorite request for lifting an arbitrary restriction:
non-powers-of-two denominators in displayed time signatures.)
So, for the time being, for 72 equal with playback, you can either (a)
work within this limitation in the non-standard key signatures and just
have seven accidentals up or down, with tuning external to Finale, which
is not enough to deal with #s and bs modified microtonally, a serious
restriction AFAIC, or (b) use note-attached expressions, with pitch bends
generated note-for-note within Finale. To be honest, I would personally
probably go the note-attached expression route, which not only gets around
the accidental limit but also avoids running out of available midi note
numbers in playback.
Daniel Wolf
Frankfurt
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