I own an older Seleco projector, which only comes with one remote. I had the problem, that the beamer would not respond to "learned" codes of any programmable remote. I found out, that the remotes I used were simply not strong enough (I sit directly under the beamer, so reaching the front or bock ir-eye is not easy) the strong ir emitters inside the pronto helped, but the real solution was to get an ir-extender system (which i directly plugged into the remote-socket on the back of the seleco). i dont know if this helps you (maybe also a possibility for the amp ?) - if you are interested, check out
www.xantech.com (i am not affiliated with them, its just the system i use....)