Thanks Mark!

Unfortunately these don't seem to work at all for me (no visible reaction when sending either code).

I'm currently trying to "calculate" the correct codes for the older buttons, using the information from Barry Gordon's "The Pronto's IR Code Format" article, the known command codes that I found on the net and the protocol details from the English Wikipedia article about the remote.
Maybe I can figure the rest out when I get those "normal" codes working.

Sebastian