I purchased a second hand Helix Floor and have a strange problem. Well, the left knob (Preset) works the other way around: turning it to the right decreases the preset numbering, turning it to the left increases it. I tried to change something in the settings and can't find a change in the direction of the knob. Factory reset doesn't help either. It seems unlikely to me that the factory was wired upside down. Is there any way to change this in the settings?