Tom,
I may be wrong (wouldn't be the first time, eh ?), but.... I think you have to go to the Global setttings, MIDI out (page 16-5 of the 3.0 Eng manual) and set each midi channel to the one you want.

I believe you then have two choices...
1. Get the Sonar templates (cwp for project and .ins for instrument defs) from the IA PA80 d/loads section (I can email it to ya too !!) and use that.
2. Set all midi channels to rec, label them, set them up for the specific midi input channle coming from the PA. 'course, you'll have to do this every time you record from the PA.

I would recommend #1 as there are .doc files in the download that detail how to set it up.
Let us know how it goes, or if you need a care package from me !!
Regards,
Steve