Sonar Newb Question - Bus Behavior

Greetings; I've been getting some weird Sonar behavior that i don't understand...hoping someone can help me with this.
 
I set up a stereo drum track using Battery and recorded it. From this stereo track, i set up a send over an ADAT output to an external effect -- the send was pre-fader. Then i set up an effect return in Sonar on another audio track.
 
I was hoping to hear what the 100% wet effect return sounded like, but even though i set the volume fader as low as possible on the drum track, i still heard the dry signal alongside the wet effect return.
 
I tried to accomplish the same thing by closing down the send, and setting the output from the drum track directly to the effect -- same result; a dry signal alonside the effect.
 
When i recorded the effect return, it turned out to be 100% wet, as expected. But i don't understand where the dry drum signal was coming while monitoring the effect. (I did double checked to make sure that direct monitoring was switched off on my audio interface.)
 
This isn't a huge, killer problem, but on a different DAW program that i sometimes use, i can isolate the effect return signal when desired. Is it a program quirk that i can't do this with Sonar?
 
Regards
Glenn  
 
 

I think you have to have input monitoring on to hear the wet signal. Check it and see. Maybe mute the software mixer channel as well. That's probably where you're hearing the dry signal from.