I made a little progress.
SONAR has a series of means of specifying the patch used with the Integra-7.
First, the INTEGRA-7 driver must be loaded, along with an instrument definition file. In my system, the Integra-7 is 2nd on the list of instruments, so when I use it on a track, the output is defined as the Integra-7, the 2nd instrument in my list. Fine so far.
Secondly, the specific Midi channel for the track must be defined, in this case, channel 1. So, the menu shows "1: Roland INTEGRA-7 Studio Set. Fine so far.
Thirdly, the bank must be set, in my case, BANK = 10880-INTEGRA 7 Studio Set (which duplicates the information in the channel section.
Fourth comes the patch information, in my latest attempt is "6:Rock Band Set". Since I have loaded the Rock Band Set into my Integra-7, I should be getting Part #1 when I create a Midi track assigned to Midi Channel 1.
Part 1 of the Rock Band Set happens to be a nice organ sound, but that is not what I get. What I get is nothing, because the Integra-7 changes sets as soon as I start a Midi song, and it defaults to Nothing. I get an empty set with nothing in Part 1, so no sound.
What fixes that is a Patch Change command to "6", which reloads the Rock Band Set after a Midi song starts. In that way, I can hear the organ from Part 1 in my Midi song. Trying other channels results in nothing, and I have not solved that problem.
This Integra-7 may be usable with SONAR after I figure it out, but so far, it is a one trick pony.
I have yet to see a post from anyone who ever got this to work with SONAR Platinum.