Home › Forums › Products › Stompboxes › Musicom Lab EFX 3- Help…. › Reply To: Musicom Lab EFX 3- Help…. May 17, 2014 at 2:19 pm #136669 Mesa ManMember YES!That was it. Of course the midi command cannot go through if the first stompbox in not on "thru" mode. Thank You for your soonest reply. I received help and problem is solved.