Hi, My new HD500x seems to have an issue with the exp pedal. from power up, std presets aren't controlled by the pedal.... the toe switch works.... so when you press that you can hear that you are switching between wah and vol but moving pedal position changes nothing? These are std presets so min max etc are set as standard...... hardware issue on a brand new unit?.... am I missing something? Have re-loaded Firmware but no change......