Dirty or "Unclean" codes is discussed here.

[Link: remotecentral.com]

The IR codes that Barf provided are the NEC1 Protocol with the exact data required, nothing less, nothing more. In short, they are in perfect format.

As a test, can you try this code for Volume Up that I've modified slightly?

Volume Up Modified
0000 006C 0000 00022 015B 00AD 0016 0041 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0041 0016 0041 0016 0041 0016 0041 0016 0041 0016 0041 0016 0041 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0016 0041 0016 0041 0016 0016 0016 0041 0016 0041 0016 0041 0016 0041 0016 0041 0016 0016 0016 0016 0016 0041 0016 05F7

You will need to press and hold the button to test this but hoping it will work. If it does, then we need to look at some other things.

And, which Pronto do you have?