Steve,

In response to the Denon codes. The channel up and down buttons should work for the tuner presets if you used the 0160 code. I don't know the answer to q.2. The surround key (SURR) on the 15-1994 cycles through the various DSP modes. There is no way to select them individually even on Denon's own remote. The display key will give you access to the OSD menus and cycle through them each time the button is pressed. You will have to learn the cursor keys and the select keys from the original remote to actually use the menu system. Hope this helps.