to the lower left of the screen there are three buttons...PATTERN, CUSTOM, and A/B.
Your custom STYLES are when u push CUSTOM button (the middle one I think).
Difference between style, custom style and patter is:
-style is what the factory built into ur x1
-custom style is when u take one of the factory ones and modify it urself and save it as custom style
-pattern is a style you create from sctach using only the sequencer (PATTERN EDIT).
I hope this helps.
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Samer