microapp
I looked at the Fishman release notes.
It looks like Progression will only rewire audio. There is no MIDI out which would control synths in sonar or make a MIDI track. You can export MIDI to a file but it looks like you are already doing this.

Progression does not let you play back through TriplePlay or other virtual instruments directly; however, you can export your score from Progression as a MIDI file and, using a Digital Audio Workstation, play your converted score through any virtual instrument compatible with the DAW.

This discusses Studio One and Notion rewired. Again, looks like audio only
http://blog.presonus.com/...-notion-to-studio-one/

Yeesh. I'm getting the impression this is another one of those scenarios where my wants/needs simply exceeds the current technology. As a n00b (well not so much these days but still pretty green) I was/am consistently dumbfounded by the sheer power of digital audio stuff that I just kind of assume certain things are possible/obvious but then have to check myself/expectations frequently when stumbling upon cases like this.
 
Pretty easy to forget how young so much of this tech is.
 
Still a little frustrating of course but there was a reason I never bothered pursuing computer recording until recently. It was simply not able to do what I wanted/needed within my budget and/or IQ.
 
Truly a golden age for us independent musicosmologists.
 
;-)
 
Thanks for checking that out.

Simple answer, unfortunatelqy : no, it doesn't.

Notion does, Sibelius also, etc.

Don't hold your breath waiting for GP7, the 6 version has been around for many years..............

BTW, i've found its midi handling is OK, for what i do.

Cheers,
Jerry

I use Gp6 every day. Great program, but sadly no rewire.

I don't understand why you feel the technology you want doesn't exist. It just doesn't exist in GP6 yet.

I use several programs that will rewire, such as Notion and Musescore.

Check out the later, there are loads of tutorials and it is free.