You won't be able to unless your AV Receiver has IR codes for specific volume levels, or allows you to create and save "volume level presets" in the receiver. I think that certain high-end Yamaha receivers might have (or had) that feature.

Fixed volume levels are typically done using two-way serial or IP control. A bit further up the remote control "food chain" than the MX-450.

If your receiver has input adjustment settings, you can raise or lower source volumes a bit that way.