Roland S-1 Owner's Manual page 37

Editing the notes, performance data and motions
When the unit is waiting for you to execute or cancel, you can delete only the parameter for a specific knob from a motion by
turning that knob. (This is executed when you turn the knob.)
3. To execute, press pad [2] (ENTER).
If you decide to cancel, press pad [1] (EXIT).
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