Yamaha MTX Series Setup Manual page 71

Example 3) Using cascade mode to add MTX input channels (analog connection)

Settings in the "ROUTER" screen
In the "ROUTER" screen you can assign zones to outputs.
In this example, since ZONE1 will be output to OUTPUT1 through 4, set the MTX units of ID=01 and 02 as shown in
the illustration.
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MTX Setup Manual