Yamaha PLG150-DX Owner's Manual page 13

This function lets you switch back and forth between the current edited condition of the
voice and its original un-edited condition. This allows you to easily hear and compare
the changes you make to a voice with its original condition.
Using Compare From the Edit Panel Window
z Select the Edit mode.
Click the [EDIT/COMPARE] button.
x Edit the voice as desired.
As soon as any parameter has been edited, a dot appears at the bottom right of the
voice number in the LED.
c Select Compare.
Click the [EDIT/COMPARE] button. In the Compare condition, the voice number in
the LED flashes. Play the connected MIDI keyboard (or click the keys in the DX
Simulator window) to hear the original un-edited voice.
While Compare is active, the voice cannot be edited. (Moving the DATA ENTRY
slider has no effect.)
v Click [EDIT/COMPARE] again to return to the edited condition.
Click the [EDIT/COMPARE] button as often as you wish to go back and forth
between the two conditions.
Compare
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Operations /
Compare