How are you achieving the split? If you're splitting the upper/lower parts of the keyboard so they send on different channels, you can have your two instruments on different tracks that are only accepting MIDI on those channels. The sustain pedal is only on one channel, so it'd only be accepted by the appropriate track. However, this doesn't answer the more general question of "can I block a particular CC from a Live Device" which I don't know the answer to.
    Warrior Bob 6 years ago