Velleman projects VM116 DMX lightplayer Usermanual - Manual (Page 6)

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Settings
This screen can change depending on the type of device you have chosen.
The button for the number of channels is the only one shared by all devices.
When you create a new device you should start by entering these values, as this
will determine the number of rows to be created that will allow you to program the
settings for the channel in question.
Show Sliders
Clicking this button displays the sliders for the current device.
This enables you to test the DMX channels so you can see what you have to
program.
Don't forget to set the correct start channel for your device!
Move the sliders to see the level number. You can write down each level number
and use this to program the device.