Yamaha Electone EL-500 Owner's Manual page 126

Extend(ed) Set
Consists of 29 different drum and percussion instruments.
Assigned to the Upper Keyboard (13)
Assigned to the Lower Keyboard (16)
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126
NOTE:
Some of the instruments such
as Tom 1, 2 and 3 on the
Upper and Lower keyboards
are the same. The instruments
marked with the underlines
are exclusive to the
Extend(ed) Set.