Hi LU,
I don't know if this will help because I don't have hd sx6 but as far as I know the only way to read the cords from a Midi file is to us a program that can do this.
Band-in-a-Box and PowerTracks both will display the cords in a midi file(if it can) when a Midi file is loaded.
Maybe others know if the keyboard can do this also.
Heather
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Heather- Leesburg, FL PR54