Yamaha VL-1 Feature Reference - page 16
Manual is about: Virtual acoustic synthesizer
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Feature Reference
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General Operation
Selecting & Editing Parameters
Once you’ve locate the display page that contains the parameter(s) you want to edit,
simply use the cursor buttons to move the cursor to the parameter, and then use the data
dial or the = and - buttons to set the parameter as required. The data dial is ideal
for quickly covering a large range of settings, while the = and - buttons are best
for small stepwise changes.