Transpose trk prg seq

Hi, I'm running jjos128 with the big screen on a 1000. I'm totally curious about a the transpose function from the main menu, I know what transpose does but I'm still confused about something. if you go to the left of your sample in the main screen, then jog wheel right past cycle and pc etc until you get to transpose you can the select the plus or minus value and whether to hold or not, that's all straight forward to me but you can then select trk, prg or seq. my problem is that I have no idea which does what??? They all seem to have the same outcome.

Any help would be great, it's probably something I'd never use but it's annoying me ( : an I can't find it anywhere in jj's manual.

Thanks for any help!

Woo I finally figured part of it out, seq transposes all notes in the sequence so say you program pads 1 2 3 4, then you transpose by +1 it will now play pads 5678.
I'm still confused about trk and prg though, they seem to do exactly the same thing which is to transpose the selected pad/ pads by how ever many values I set.

Any ideas?

Cheers