Hey Ben, Sorry for the late reply.
I figured that one out too for the 61, pretty great!
And from the looks of it, those for the 88 and 61 are the same message, so I think it should work for 49 users too.
As another example this one says, Loaded Sound: Usersound
F0 00 20 6B 7F 42 04 00 60 01 4C 6F 61 64 65 64 20 53 6F 75 6E 64 3A 00 02 75 73 65 72 73 6F 75 6E 64 20 20 20 20 20 20 20 20 20 20 20 20 00 F7
I was also checking if there was a Sysex message that would light up a note, but now we have just note on messages since the new firmware.
So far I love how tweakable the Keylab is, although you have to do some searching, would be great if there was was more info on this.