This question should probably have occurred to me about a year ago. Now that it has finally entered my head I'm struggling to make sense of it.
Finale comes with dynamic expressions programmed to use velocity e.g. mf is defined as 'Key Velocity = 75'. Now, in GPO only the non-sustaining instruments use velocity to affect volume, while the sustaining instruments use CC 1 for volume, and velocity to alter the initial attack.
So my question is how come the standard Finale dynamic expressions appear to affect the volume of the GPO sustaining instruments? As a supplementary question, does it make sense to create a separate set of dynamic expressions based on CC 1 for use with the sustaining instruments?