When switching from DVD to CD, I'd like to turn the Sound Field [Dolby] on or off, appropriately.

This is a Sony amp.

I found a code, but it toggles -- isn't there a discreet on and off?

Trying to avoid manually changing the amp settings all the time. Thanks.

Looks like the discrete code 178, Sound Field Toggle, is the only one. Usually it is the way the manufacturer programs the component that determines if there is a discrete code. If it isn’t programmed for discrete codes, then there is no way to assign one. The OFA site is very thorough, and if there was a discrete code they would have listed it. If your original remote does not allow easy access to the sound field toggle, you can always assign the 178 code to a key on the 3000 (by using a RS/OFA remote and sending the discrete code) so you would only have to press one button to toggle the sound field. If you want to be sure, post your question on the OFA site [Link: remotecentral.com]

Most Sony Amps remember what sound field each input was on last.
The older ones dont.