I'm not sure that I understand, but I think you are trying to control 3 stompboxes with a pedal connected to the first one. This will not work (although we (Eventide) should consider allowing a connected pedal to be a MIDI control source).
For now, you probably have two options:
1) Use a MIDI pedal. This sounds like the solution, but probably will not work, as you presumably have each box set to a different MIDI channel.
2) Make (or have made) a 3 way 'Y'-lead so that you can directly connect a pedal to the 3 pedals. This will work, but there is a risk of ground loops if you are not careful.
