Thanks, John.
And to answer your question it's for some of the ultra specific guitar oriented tab/notation tools AND that GP files are kind of a standard for guitar educational material. If you poke around the internet for guitar tablature you'll generally see a lot of text based tabs (which I am proficient at but they are a bear to type up manually and are really limited for the end user) and GP files for users to download and open in GP which are much more thorough/informative/editable/etc (as well as being multi-track).
It's just kind of the go to program for guitar dorks and that, of course, will be my main audience.
By being able to integrate it into Sonar it would allow me to offer a bunch of formats at once for any prospective students by way of the GP files, standard MIDI files, regular audio files, hard copy notation and tablature files (for printout), etc.
Also being a guitar related program it offers quite a bit more in the way of scale and chord options for composition and eductaional purposes for guitar players.
It's kind of like why orchestral folks would use something like Sibelus or other high end notation software except it's geared toward guitar freaks (which require a whole 'nother level of intracies due to the nature of guitar due to the massive amount of alternate voicings/positions/etc than other instruments).
Hopefully that makes sense.
Cheers and thanks again for moving this.