I'm working on a new project and am having a bit of a problem.  It seems some plug-ins on a stereo bus are causing the stereo image to shift.  For instance, I am sending a mono vocal track into a stereo bus (only track sent to this stereo bus at this point) and using plug-ins on the stereo bus pro-channel.  I have the Plus 10 dB channel strip on the bus and when I use the dry knob (moving towards 100% dry), the stereo image moves to the left channel.  
 
Should note that when I engaged the 10db plug-in, the right channel on the stereo bus showed an increasing signal as I went from wet to dry and I heard a buzz only in the right channel as I did this.  This even happens when there is no playback.  I then deleted the bus and started over again.  The majority of the issues are still there (imbalance and noise in right channel only as I adjust the wet to dry setting; however, it no longer shows an increasing signal in the right channel;  Remember, the left channel actually increases in volume.).  I also am having a slight stereo imbalance issue with the Waves ADT plug-in, which I am currently demoing.
 
I have tried forcing the Plus 10dB plug-in to stereo operation from mono processing, and vice-versa (deleting then re-adding the bus in-between changes), but that didn't fix the issue. 
 
I have checked my panning settings, so that's not the issue.  Any thoughts?  Please let me know if you need any additional information.

Thanks,
 
 
Paul

Hi Paul,
First welcome to the forum. I just tried to replicate your symptoms and I couldn't do it. I have a mono audio track routed to a stereo bus with the Plus 10 db on it. I tried it in the fx bin, as a Pro Channel module, and in the Pro Channel FX Chain bin, both VST2 and VST3. Levels stayed equal on both sides.
 
I know that's not much help, but I can't think of much that'd be causing that behavior. Might be worth a call to support.
 
Dean

Thanks. 
 
To clarify for others, I do have it in an FX bin on a stereo bus and am using the VST3 version.  I have no issue if I add it to the Pro Channel on the track, instead (again, in an FX bin).
 
p

UPDATE:  After messing around with some settings, this only seems to happen (on the bus) when I have the Expander or Gate engaged.  Also, I was able to duplicate this on a project started with X3e.
 
p

Does VST2 format have the same problem?

Yes.

Go to Preferences > Audio > Driver Settings and uncheck "64-bit Double Precision Engine" then open the project.

Seems to have fixed the problem.  Thanks!  However, isn't the 64-bit Double Precision Engine a good thing? 
 
p

Not in this case. However, it should not be necessary to turn off the 64bit DPE to solve this problem.

pjchappy78
Seems to have fixed the problem.  Thanks!  However, isn't the 64-bit Double Precision Engine a good thing? 
 
p

Hi Paul i have +10db and i have not this problem with 64 bit engine.
It's very strange....i'm using a vst3 version.
Maybe you could reinstall the core sw of Sonar and +10db.....it's fast
Good luck