Yamaha Electone EL-900m Owner's Manual page 32

By pressing ON button while holding down COARSE button:
All the registration memory numbers can be selected by pressing the
Data Control buttons corresponding to "ON" with the COARSE button
held.
By pressing OFF button while holding down COARSE button:
All the registration memory numbers can be cancelled by pressing the
Data Control buttons corresponding to "OFF" with the COARSE button
held.
By holding ON and OFF simultaneously:
Holding down "ON" and "OFF" simultaneously turns on the registration
memory numbers that contains the same voice as the one which is
currently set in the registration at the cursor position.
In this case, the registrations 1, 2, 3, 4, 6, 7, 8, 14, 15 and 16 are shown in a solid bar
indicating that those contain the User Voice 2, Str.2.
4 SET
Uniforms the currently turned-on parameters' values to the one in the
currently selected registration (at the cursor position).
Pressing [Set] opens the dialog box urging you to confirm the operation.
In this case, the operation uniforms the brilliance values of the Upper keyboard Voice in the
registrations 1, 2, 3, 4, 6, 7, 8, 14, 15 and 16 to the one in the registration 6 (at the cursor
position).
If you proceed the operation, select [Uniform].
The completed message will momentarily be shown on the LCD.
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