JL Audio MCS-3800 - Manual (Page 71)

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Wave Demo
For the fader wave demo, hold the UP cursor button while
powering up the unit. Continue to hold it for about 3 seconds,
until the demo starts. Turn the power off to stop the demo.
71
About Query Mode
When a switch is set to Query, it will not send a command.
When pressed, it puts the whole unit into Query mode.
In Query mode, no commands are sent, but the LCD will
display all the assignment parameters for the last control
activated.
Notice
In the initialized state, from the factory, the M buttons have
"MMC" selected, which is one of the last menu items.
If you want to assign an M button to send a Note or Controller,
for example, you will be rotating the encoder significantly
counter-clockwise to select and earlier menu item.
Number
Selects the Controller, Note, or Program number.
For M Buttons, when set to MMC, number is the targeted
Machine ID number.
Channel
Selects MIDI Channel 1 through 16.
Minimum (or Release Velocity)
Minimum controller or note off velocity value.
If the switch is Latch Off (see below), this is the value sent
when the switch is released.
If the switch is Latch On (see below), this is the value sent
every other press, when the LED turns off.