As you have discovered there is just one speaker setup (delay and trim) available in the 990. Before the latest firmware was released there were a number of requests for each input to have its own speaker settings. If that suggestion had been implemented you'd be able to do what you suggest. Unfortunately, speaker settings for each input was not included in the update. I don't know if the 990 can be modified to include that feature but it still is at the top of my list of 990 updates I'd like to see.

This work-around might help when you are listening to stereo music. I found that I like different L & R trim levels when watching movies versus listening to stereo music. When I'm listening to music I turn on the 990's trim menu and adjust the R speaker according to taste and the recording; I really like that stereo image right down the middle. I typically adjust the R trim anywhere from 1 to 3dB from what was determined by test tones and my SPL meter. I turn off my plasma to avoid burning in the menu image. When I'm done I return the R speaker trim to the original setting.

By the way...nice furniture.