How do I prevent the patch from advancing multiple times per switch press?

I'm using Mainstage 2.1.3 with a Roland RD-300SX. I have an FS-5U foot switch that I'd like to use to advance patches plugged into the Roland's control switch port. Regardless of what I've set the Roland to send for that port, it sends one or two messages with a value less than 127 before sending the value of 127. This causes Mainstage to advance 2 or 3 patches each time I press the switch.
I saw that recent release notes said that this didn't happen for the sustain pedal now. Indeed, it does not. However, I need the sustain pedal to sustain.
Is there any way to get Mainstage to only advance one patch in this situation? Perhaps set a threshold value for the action?

I've had this problem - bad polarity on the pedal was my demon.
I have found a very stable configuratio.
On my 88 note midi-master keyboard, the lowest note has been assigned to step back one patch, and the next black note, to advance one patch.
This works just fine, and these are notes I never use - just be careful if you do big "sweeps" of the keyboard to STOP before these last two notes.
Sort of "off" subject.
Mainsatge 2.2.1 and OS 10.7.4 are unstable.
Deleting the "CPU/Ram" meter has been suggested as a fix, or shell out for MS 2.2.2
Or, apparently OS 10.8 fixes the stability problem.
Good luck

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