What I was indicating there is that I did not have to put a delay step in the macro as recorded on the MX-850, but I have no idea whether any delay would be needed when splicing the hex strings together.

I've just finished reading Barry Gordon's article (very good) and understood it. The NEC1 Code 64 .ccf I generated matches his NEC example in pattern, though the numbers are slightly different. I can understand how a single command works.

But I have yet to read or understand how to splice them together. That's the next step. But I see a problem right off: the NEC transmissions are always of fixed length--a 32-bit ones-compliment code.