Roland DP90 ユーザーズマニュアル

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Convenient Functions
Disabling the Buttons (Panel Lock)
When you activate Panel Lock, all buttons will be disabled.
This prevents the tones or settings from being changed if you 
inadvertently press a button.
1. 
Hold down the [AB Repeat] button until the following 
display appears .
Panel Lock will be activated.
All button operations will be disabled.
2. 
To cancel Panel Lock, once again hold down the [AB 
Repeat] button for a while .
Panel Lock will also be cancelled when you turn off the power.
MEMO
•  If you activate Panel Lock while a song is playing, playback will 
stop.
•  You can’t activate Panel Lock during recording, while in Function 
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Panel Descriptions
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