HI:)
You can view as much tracks as you want in the PRV!
Take 2 Tracks, activate a Drum Track on one, select both and open PRV.
Now you have Drum View for one and Note View for the other track.
It can be that you have to grab the line between them to make visible the other window.
You must have 3 Windows in ONE, Drum Track, Note Track and Controller view:
Just made a short example for you:
https://1drv.ms/i/s!Al2mKojzOW0Mk55CWDYahc7ZHTI2_g Newest Sonar Version...
Bassman.