Thank you so much for these detailed instructions! I've had the CT-X800 for over a year and I don't know how I overlooked this great feature!
The manual is not very clear about this either and it says nothing about exporting track1 / all others separately.
By any chance can you recommend a MIDI software that can be used to combine and edit the two exported MIDI files? (MacOS or Linux options preferred!)
I'm trying with Crescendo and MuseScore3 and my frustration is just growing.
I wonder what happens if you record track 1 empty and use the other tracks 2-6 for actual notes. Then you'd only have to export one time. I will try this and see what happens.
Again, thanks a lot for sharing this!