If you go to Sys Setting an set basic midi ch to 1. this should be page 2.Exit an go to stage setting.hit edit..enter go to midi edit hit enter
go to page 2 set midi out zone 1 to one..go to zone 2 set midi to off..go to zone 3 set midi to off.go to zone 4 set midi to off...
to navigate zones use zone buttons on the left below led screen.this should help