Hi - this looks interesting. Did you try it in Realband? When I did it, it did NOT make the mono track I used into a stereo track. I did Edit / Audio Effects / DirectX Audio Plugins then Process. It only cut the volume on the track a bit.

Then I also tried starting with a mono track that I made stereo/mono by saying 'no' to mono when importing the track into Realband. The plugin did not move the right side of the track at all (the delay feature) so there was no delay heard.