OK, you have a server that has a zone for output, but you're playing the server's music to JRemote2 on the Android phone. Correct?
If so, that playback doesn't have any DSP associated with it, and whatever you send to the Chromecast device also won't.
If the audio system was connected directly to the server, you might be able to get what you expect and still control it from a remote.
Just a comment about your support expectations. The $10 you spent on the app doesn't include consulting.
More details about your setup might also make it easier to help.