hi pay_c thanks for replay I've read some more info on midi box so I've decide to do a midi box 64e for have 19 encoder 12 switch 12 led I need 2 dinx4 and 2 dout4 is correct. Zone 1 works for midi ch 1 and 2 using the same encoder and switch, for cange midi ch only for this zone, I need another sw? ok I can assig multiple midi ch on each enc and sw? Maybe is better have a sw for edit one ch at time, but this sw, for cange the midi ch assignment of all enc and sw of zone 1, is assigned at what comand? thanks