Pre-wired balance control (blend) and master volume with separate bass and treble pots. Along with the concentric mid-control (stacked).All the EQ controls and balance control. For passive pickups, the BQS System HZ features a pre-wired balance control (blend) and master volume with separate bass and treble pots along with the concentric mid-control (stacked). All the EQ controls and balance control feature center detents. So please do not be concerned if you see that. This form of tracking does not update every step of the way. The item "EMG BQS HZ System Passive Mid-Control, EQ, Bass, Treble, Balance, Volume (TUNER)" is in sale since Friday, December 19, 2014. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Guitar Parts\Pickups". The seller is "dont_tell_the_wife_guitars" and is located in Lake Elsinore, California. This item can be shipped worldwide.