First, let me apologize if this is a redundant post. I've spent the last couple hours sifting though similar posts and downloading converters, but nothing seems to be working for me. Hopefully one of you can point me in the right direction.

I work with a company called ReQuest Multimedia. We make the AudioReQuest Digital Music Server, of which some of you may be familiar. We have a CCF file for all the current IR codes that works fine. We have recently added support for some IR commands that don't exist on our remote, leaving me no way to "teach" the Pronto. I'm trying to decode the protocol and hack the CCF so that I can transmit the new codes, and I'm having trouble doing so. Below is all the information that I have on the IR protocol and some sample Pronto Hex strings. If anyone knows of a utility to use to convert these codes (or can perhaps provide some instructions on how to use the utilities on this site) it would be much appreciated.

Carrier Frequency: 38 kHz
Baud Rate: 1200

All codes are 3 bytes + 1 bytes checksum (4 bytes total)

Checksum is the XOR of the other 3 bytes

Samples:
======
Button #2:

4-byte code:
02 18 32 28

Pronto HEX:
0000 006a 000a 0000 0040 0021 00c0 0041 0080 0041 0060 0061 0040 0021 0040 0041 0040 0061 0080 0021 0020 0021 0040 0021
------------------------------------
Button #3:

4-byte code:
02 18 33 29

Pronto HEX:
0000 006a 000b 0000 0040 0021 00c0 0041 0080 0041 0060 0061 0020 0041 0040 0041 0040 0061 0020 0021 0040 0021 0020 0021 0040 0021

======================

Examples of codes that I need to convert to Pronto strings are:
02 18 F1 EB
02 18 F2 E8
02 18 F3 E9
02 18 F4 EE

Thanks,

Brian