In response to "Onkyo receiver" by Mike on 05/11/98 03:08:48:

As you need the original signal before you can program it in the Pronto, you can thereby only program what you already have. So, no. On my receiver there's also a button that's not duplicated on the remote. There's even probably an IR signal for it - but since they didn't put it on the remote there's no way to use it.