The audio interface isn't in the loop, the Oxygen goes straight to the computer via USB. I will endeavor to persevere with the manual. 

revnice1
I'm entering notes with a controller and they're all getting doubled.
 
I've got Echo off in the Track View and 'Always Echo current MIDI track' off under Options > Global 
 
What else is there?
 
Thanks - rev

Turn local off on the keyboard and enable echo in the track header.

Dummy keyboards don't have a Local.

Some specifics might help here.
Make/model of controller.
Is it going through a MIDI/USB adapter?
General system specs.
Your signature is a great place to put this info, so it is readily available for troubleshooting. That's why you see it in so many of our posts.

b

I'll make sure it's excluded by Sonar. I agree, I don't think it's broken. I'll try everything and post back.

The problem went away as mysteriously as it started. Everything is working properly and I have no explanation of how it happened. I did learn that you can see exactly what your controller is sending by installing a copy of midiox which can be found here:
http://www.snoize.com/MIDIMonitor/
 
Under View, choose Data Monitor, then move your knobs and sliders and press keys. Any anomalies will show up in the Data Monitor View.