Yamaha Electone EL-900m Owner's Manual page 27

Bar/Beat
As the name implies, this works as the bar and beat indicators. The difference
from the existing Bar/Beat Indicator (LED in the Rhythm section) is that this
indication is independent from the Tempo display and you will not miss every
beat even when the tempo change occurs.
Also, you don't need to twist your head to see the current bar/beat.
Bar/Beat indication when rhythm starts:
Bar/Beat indication when rhythm is off:
When you currently stop the rhythm, "STOP" is displayed.
Bar/Beat indication when rhythm is in stand-by mode
(Synchro. Start):
Registration Shift
Registration Shift, off:
The current position/registration is displayed.
Registration Shift, in "Shift" mode:
The current registration number (left) and the next number (right) will be
displayed.
Registration Shift, in "Jump" mode:
The current registration number (left) and the destination number (right) will
be displayed. You can change the destination number even in the middle of
the performance by pressing the appropriate Data Control buttons.
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