MF don’t recognize CC#7, another MIDI solution?

Hello everyone!

I need help to find a solution. For a setup show, I have a master keyboard that controls 4 other keyboards including the MicroFreak. But yesterday, I discovered that the MicroFreak does not respond to controller #7 (volume). So I have to find another solution otherwise I will have to get rid of the Microfreak. Sad… How to mute the MF via Midi? (And unmute). Here are the CCs that the MF recognizes:

Glide 5

Type 9

Wave 10

Timbre 12

Shape 13

Cutoff 23

Resonance 83

Rise/Shape 102

Fall/Shape 103

Hold/Sustain 28

Amount 24

Rate/Swing 91

Rate 94

Attack 105

Decay/Rel 106

Sustain 29

Hold button 64

Spice 2

I’m afraid that I won’t be able to do much with this to solve my problem. Does anyone have a good idea? I absolutely have to go through MIDI.

Thank you!