Why is Mainstage responding to MIDI CC from unassigned channels?

Hi. I'm wondering if i can get Mainstage to quit responding to CC#7. I've a setup running audio in 2 channels from MIO Console into 2 audio channels in Mainstage, and out seperate outputs. I've set up a tap tempo with the metronome out 17-18, part of my monitor mix back in MIO Console. (MIO Console routes a bit like Soundflower, and works with the Metric Halo hardware). I have an external instrument strip that does nothing but route the MIDI clock out IAC bus 1. I've a few plugins set up on the channel strips, and controls mapped - volume sliders for the channel strips, plugin parameters, the tap tempo- from my hardware, a Novation Zero mkII (NOT on effing automap). All the controls are mapped to channel 1, port one on the Novation. There is a MIDI Activity button on the layout set the same. Everything works great, I'm enjoying the design of Mainstage a lot.

Here's the problem: in Plogue Bidule, which I'm running alongside, I'm running the audio from MIO Console into a frequency analysis plugin, which spits out MIDI CC's responding to various dynamics of various frequencies in what I'm actively playing. This is set to MIDI channel 7, sent out to a Bidule virtual port (nothing happens to the audio). These MIDI messages then alter parameters in a VJ software in realtime. Unfortunately, when one of these controls is set to CC#7, the volume sliders on both channel strips in Mainstage respond to them. There are no virtual instruments in this setup.

I have not set anything in Mainstage to respond to MIDI channel 7, or input from the Bidule virtual port. All controls and parameters in Mainstage are set to respond to channel 1 from the Novation, unless there is something major I have missed, which is what I am hoping.

It would be a lovely setup if this wasn't happening. Does anyone know how to fix this, how to get Mainstage to only respond to a particular MIDI channel instead of all of them?