Brian, attaching MIDI events (usually pitch bend) to symbols is indeed one method of making microtonal notation with playback in Finale. However, it’s also possible to define the number of divisions in the octave and the number and position of diatonic (“white”) and chromatic (“black”) notes, and use your own symbols as proper accidentals, with key commands, transposition, correct spacing etc., and have polyphonic playback without pitch bend. A similar implementation is Dorico’s eventual goal but where Finale uses a pre-tuned instrument and transpositions in midi notes (steps) - which is awkward in large pitch gamuts as there are only 128 notes per channel -, Dorico’s microtuning solution is VST3 parameters. (When they figure out how to use them for microtuning.)