Katana Artist Volume issue

I no longer want to have to use the Boss GAFC footswitch now that I have my MC8… However my problem is that I cannot get the amp preset volume to be slave to the position of the expression pedal like it was on the GAFC between presets. Every time I change presets the amp defaults to the amp channel volume, not the expression pedal position now that its plugged into the MC8. I have to move the expression pedal to catch midi info every time I change channels. How do I fix this? Thank You.