Roland BK-9 Owner's Manual page 64

Performance Lists
2.
Press and hold one of the RHYTHM FAMILY buttons.
A "Rhythm" pop-up window appears with a closed lock (see left). (If
you repeat step (2), the pop-up window will display an open lock to
inform you that the lock function has been cancelled.)
The Main window shows the Lock status:
Left Display
3.
Start playback of the selected rhythm.
4.
Select a different Performance memory.
5.
If the status lock shows "RHYTHM" on the main page,
recalling another Performance does not change the
rhythm.
6.
Again press and hold any RHYTHM FAMILY button to
unlock the "RHYTHM" function.
The following pop-up windows appears to indicate that the lock
function has been cancelled.
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Left Display
Left Display