If you learn how to use it, you can generate all those Pronto Hex strings using MakeHex
[Link: hifi-remote.com]
You'll need to do some hex to decimal translation outside MakeHex, and you'll probably need a few other programs such as IrTools and DecodeIr.dll to help get the information you need to feed MakeHex.

MakeHex does not convert directly from the "AA 1A" form. No general purpose program could convert from just that.

"AA 1A" is not enough information to uniquely identify an IR signal. It is enough to uniquely identify a Pioneer IR signal. A similar amount of information would be enough to uniquely identify a Yamaha IR signal. But if "AA 1A" were a Yamaha signal it wouldn't be the same signal that "AA 1A" is as a Pioneer signal (It would be close enough that some devices could be fooled, but even that is specific to Yamaha/Pioneer. Pick some other brand and signal translation may be totally different).

I don't think there is any program that knows about the different concise formats used by several different manufacturers and knows how to translate them all to Pronto Hex.

Makehex knows about a single more generic concise format and how to translate signals for hundreds of manufacturers into Pronto Hex. But you need to know how to get from the manufacturer's concise format to the generic concise format used by MakeHex (and by a variety of other free tools).