GMMK Pro Knob is not controlling volume or muting

Hello, I’m seeking help with my GMMK Pro as the knob has stopped controlling system volume.

I have;

  • rebooted the keyboard using the FN + ESC then F1+F3+F5.
  • Reinstalled firmware update via Core.
  • Core is at v1.1.3.4, GMMK is at v00045.

My knob will now pop up the volume indicator to show me the volume percentage, and adjust the percentage up or down depending on the knob movement, but the system volume remains the same. Pushing the knob shows that the volume is muted, however, the sound still can be heard. Hoping for some feedback and help resolving this.