Wanted to post these for anyone else with this setup
RCA RTD315 Home Theatre with Comcast 1067BX3 (Silver w/red OK button) Remote

Follow these steps (as stated earlier) to add some more functionality to your remote for the setup mentioned above

-Press AUX
-Hold down Setup until AUX blinks twice
-Enter 9-9-4
-Tap Setup again (without holding it down)
-Enter [Code from list below]
-Press the key which you want to assign the function to
*AUX button should blink twice if you did it right

64257 Power On/Off
64258 -8
64259 -9
64261 Mute
64264 -2
64265 -3
64266 -0
64267 -1
64268 -6
64269 -7
64270 -4
64271 -5
64276 Volume Down
64277 Volume Up
64278 Previous
64279 Next
64285 Return
64291 Pause/Step
64293 Stop
64294 FFWD
64295 Reverse
64301 Slow motion
64303 Play
64306 Settings
64317 Change HD output
64322 Menu
64344 Down
64345 Up
64350 Right
64351 Left
64353 Stereo/5.1 Surround
64362 Program
64392 Adjust speaker levels
64394 Switch audio channels
64399 Balance
64404 Aux in/Audio in
64410 Tuner
64426 Zoom
64430 Repeat
64433 Optical
64442 Subtitles