How to process momentary MIDI CC in Environment ?

Question

I'm sending MIDI CC messages into the Logic Environment to control various things (it's a complicated mess of cable switchers, transformers, etc).
When my input is a toggling MIDI CC message (127 for ON, 0 for OFF), everything is working just fine... I process the MIDI input, transform it and route it... all good.
But I'd like to swap for a MIDI controller that sends momentary MIDI CC messages only (pressing a button generates a 127 immediately followed by a 0), and I can't figure out how to process that in the Logic environment. What I need seems so simple: I want an Environment button to toggle its state between ON and OFF every time it receives the same CC message, but I haven't found a way. Any suggestions ?
Thanks!
James

Answer 1

Hey, iS,
I'm using the Environment for live MIDI control, via a Rocktron All Access footpedal.
Since some of the functions I want to control are conceptually momentary, I thought it would work best to configure the MIDI pedals buttons as momentary (the Rocktron box gives a choice), and I was struggling to get Logic to process the info that way. And I ultimately stumbled across the same solution you suggested (discard zeroes, bang the fader, etc.)
But I ultimately scrapped the whole thing when I found out that with the Rocktron buttons configured as momentary, turns out they receive data that way, too, which makes it impossible to have Logic configure the state of the Rocktron button lights. (i.e. I wanted to be able to change patches on the Rocktron and have Logic update the lights on the footswitch. Doing that requires the Rocktron buttons to be latching, since if they're momentary, a value of 127 just toggles the lights, so it's impossible to use Logic to reset the lights to a known configuration)
So I went back to the latching config for the Rocktron buttons, and found I could still handle functions like tap-tempo, where you want a button to do the same thing every time it's pressed: just use Logic to send an off message after receiving an on message... works great.
Oh, and once my Environment got huge, I ran into the cable-limit... fun, fun, fun! Took a while, but I cleaned up the logic to simplify things enough to stay under the limit. Frustrating, though!
Thanks for the advice, iS!
James