Pioneer IR protocol is not "high frequency", but it is a slightly higher frequency than NEC2 protocol and some Pioneer signals look just like NEC2 signals except for the frequency.
The signal you posted in both 0000 format and 900B format is an NEC2 signal, device 165, command 68. Because device 165 is common for Pioneer and not for NEC2, I would have guessed it was a Pioneer signal at the wrong frequency (rather than a true NEC2 signal) even if you hadn't told me we were talking about Pioneer.
We can construct a Pioneer version of that signal a couple different ways: 900D 0068 0000 0002 A55A 44BB A55A 44BB or 0000 0068 0000 0022 0168 00B4 0016 0043 0016 0016 0016 0043 0016 0016 0016 0016 0016 0043 0016 0016 0016 0043 0016 0016 0016 0043 0016 0016 0016 0043 0016 0043 0016 0016 0016 0043 0016 0016 0016 0016 0016 0016 0016 0043 0016 0016 0016 0016 0016 0016 0016 0043 0016 0016 0016 0043 0016 0043 0016 0016 0016 0043 0016 0043 0016 0043 0016 0016 0016 0043 0016 06D9
The second 0000 format signal you posted is a compound Pioneer signal (device 165, commands 159 and 203), but learned at an even higher frequency, but still not "high frequency" nor into any range hard for a Pronto to learn.
It's not immediately obvious to me why that command doesn't work. If your original remote had that command than I assume your receiver supports it.
I don't think the higher frequency is right, but I don't think it's the problem either. The NG model Prontos can have trouble with the gap in the middle of a compound command (I didn't notice your model number).
