Duuuhhho .. I thought I was there, I really did .. I did don't you know.
I am using GPO in Finale then saving to MIDI then importing the MIDI file into Sonar 5.
What's happening NOW is that, in Finale, I use the 'Expression Tool' to insert a 'rall' (slow down gradually) into the final bar of my score. This is set up using GPO 'Notation' folder with Human Playback enabled. I save this to a MIDI file. The file plays back correctly in Finale.
When I import the MIDI file into Sonar, the last note doesn't stop sounding. It seems to my limited knowledge that the MIDI file from Finale has no 'Stop' data or signal or whatever the term is.
I have found a work-around which is, in Finale, to attach some articulation (I use a fermata/pause/hold) to the last note. In the MIDI file this seems to then add whatever is needed to end the note sounding.
I realise this may not be a GPO issue and is more likely to be something in Finale or Sonar. I am asking here though as there are people who are using all three (Finale, GPO, Sonar) and someone may have found the same thing happening for them. Also, I find the folks here to be more knowledgeable and friendly than most, if not all, forums I know.
Here's hoping someone will have the answer for this one.