Add-on pickup tone circuit is installed to this guitar. The circuit provides alternative basic tone setup for neck and middle pickups. It cuts out high and sharp edges of tone and gives out slightly warmer sound from the pickups. It can be easily activated/bypassed using the tone pot's push-pull switch. Each pickup tone setup can be adjusted with trimmer according to the user needs and pickup features. Circuit can be also used with H-H pickup configurations.and activation po