The tone knob on my variax 500 rolls back down at the full setting. The attached post discusses calibrating the selector knob and seems to include calibrating the tone knob as well. If this is the correct procedure to calibrate the tone knob? If so, must all knobs (volume, tone and selector) be calibrated or can I just do the tone knob? I'd prefer not to mess with the ones that are working fine.

http://http://line6.com/community/docs/DOC-3857#