Check out these two threads for more information on advanced/discrete codes. As stated in the thread, the OneForAll 6820/8820/10820 will allow you to use advanced codes, as well as the Radio Shack 15-2142 (but this one doesn'thave an amp function).

These remotes use 5 digit advanced codes and some advanced codes are only 3 digits, so just put 2 zero's in front of the code.

[Link: remotecentral.com]

[Link: remotecentral.com]