Yamaha Electone EL-900 Owner's Manual page 129

Extend(ed) Set
Consists of 29 different drum and percussion instruments.
Assigned to the Upper Keyboard (13)
Assigned to the Lower Keyboard (16)
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.
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