Yamaha MTX Series Setup Manual page 73

Example 3) Using cascade mode to add MTX input channels (analog connection)
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MCP1 settings
Here we'll assign functions to the MCP1 that is located at the chairman's seat.
To make these settings, choose the [Controller] menu item [MCP1].
When you click one of the numbered buttons, a "Settings" dialog box will appear; assign parameters to the switch.
Click the [Label] button to open the "Label" dialog box. Here you can make settings for the MCP1's display, to indicate
the role that each button will perform.
When you've made the assignments and display settings, click to select "01 [No data]" and then click the [Save] button.
In the "Save Library" dialog box, change the name to "Basic" and then click the [OK] button.
Assign the parameters. If you assigned [SD Song Select & Play], enter the name of the file that you want to play or the
name of the folder that contains the file you want to play.
L1 switch turns mute on/off for the microphone inputs other than the chairman's seat. L2 switch turns the chairman's
microphone on/off. L3 switch will access the screen for adjusting the input level from the chairman's mic.
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MTX Setup Manual