Thank you for the reply (and apologies for the tardiness of mine)

I ended up speaking to Kramer directly, who didn't seem to be able to give me any more information, other than "not all IR learning hardware outputs the codes the same". So I ended up getting my hands on a remote and trying to learn them directly.

So here is what should be Volume Up and Down codes:

Volume Up
0000 006F 0000 0012 009A 0026 0027 0026 0027 0026 0027 0026 0027 0026 004D 0026 004D 0026 004D 0026 004D 004B 00A7 0026 004D 0026 0027 0026 004D 0026 0027 0026 0027 0026 0027 0026 004D 0026 0027 1785

Volume Down
0000 006F 0004 0012 0027 0026 004D 0026 0027 0026 0027 1785 009B 0026 0027 0026 0027 0026 0027 0026 0027 0026 004D 0026 004D 0026 004D 0026 004D 004B 00A8 0026 004D 0026 0027 0026 004D 0026 0027 0026 0027 0026 004D 0026 0027 0026 0027 1785

I also have some other Kramer VP-23N codes available if anyone wishes me to post them.

Thanks