Yamaha Electone EL-57 Owner's Manual page 107

3 CLEAR
The Clear function is used to erase an instrument from the
rhythm. All instances of the selected instrument, irrespective of
which tracks they occupy, will be erased from the pattern.
There are two ways to use Clear:
[1] While holding down the Data Control button corresponding
to CLEAR, press the key on the keyboard corresponding to the
instrument you wish to erase. (A short "beep" sound indicates
that the instrument has been erased.) You can erase all of the
sounds on all recorded tracks of the pattern by holding down the
Data Control button corresponding to CLEAR and simultaneously
pressing the lowest key (C1) on the Lower keyboard. Be careful
not to do this inadvertently since all sounds will be instantly and
permanently erased.
[2] Press, then release the Data Control button corresponding to
CLEAR. The following display appears, prompting confirmation
of the operation:
Then, use the step forward and step reverse controls to advance
or reverse the rhythm clock to the point at which you wish to
enter the percussion sound.
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