Yamaha Electone EL-900 Owner's Manual page 53

Selecting LENG. (LENGTH) will display the following message.
Select [Uniform] to set the current Length value for all registrations
in the 16 Registration Memories. Select [Cancel] to abort the operation.
Selecting DEPTH will display the following message.
Select [Uniform] to set the current Depth value for all registrations in
the 16 Registration Memories. Select [Cancel] to abort the operation.
REVERB Page 2
Determines the amount of Reverb effect applied to each voice section.
Each parameter corresponds to REV. (REVERB) in the Voice Condition page
1.
1 2 3
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4
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