sharke
A little OT but I still don't understand why "none" doesn't just mean "none." 
 
Sometimes you don't want ANY MIDI reaching a track and it's ridiculous that you should have to be selecting anything but "none" to do this. 
 
Every time I insert Jamstix into a project and use its MIDI-out I encounter the familiar annoyance of having Jamstix playing a freaking crazy-ass bass line on another track until I set that track's MIDI input to my keyboard. Sort this out Cakewalk!

Anderton
I'd be happy to test this but don't know if I have any plug-ins that generate MIDI out. Do any of SONAR's built-in plugs have it, or any common ones from NI, Arturia, etc.?