You know, I also use the Korg Triton Extreme. I have had a problem with the Combis in sequencer programs. It seems to happen in both Cubase and Pro Tools, so I'm pretty sure that it is a Triton thing. When I save the Combi to preserve any edits that I have made, the original volumes on every channel reset to whatever they were at their intial states. (This means that I have them all set at 127, to give me enough headroom for sequencing.)
I have tried to set the initial volume to something like 64 -- except that the brilliant folks at Korg made it impossible to raise the volume PAST that no matter what. In other words -- the volume "sliders" in the Combi mixer are the FINAL STAGE of the gain-staging chain.
This is problematic; unless you reset the sequencer every time you want to play the keyboard AFTER an edit has been made, you end up with a volume blast coming from your speakers or headphones.
I'm a bit upset about this. I'm considering contacting Korg tech support, but I suspect that they'll tell me that I'm going to have to live with it. If anyone knows of a way to fix this, then by all means, write it here. (And PLEASE avoid comments like, "throw the @#$%! Triton out the window cuz it suks" or whatever...)
Really though -- I've considered doing just that.
Good night, and good luck.