PRS Gary Grainger 5-String Electric Bass Guitar Rosewood Non 10 Top

The Grainger 5 is the evolution of the Private Stock Gary Grainger Bass line. As the primary designer of PRS's Private Stock basses, Gary (John Scofield, Dennis Chambers, Frank Gambali, etc.) collaborated with many bass artists, including Wyzard (Mother's Finest) and Kevin Walker (Justin Timberlake), to create a Core PRS bass with all the character and quality of Gary's Private Stock models but with a more universal appeal.

Switching
Knobs 1-2 are volume controls and passive/active switch:

Knob 1: Neck pickup volume. 
Down = Active, Up = Passive If this knob is up and Knob 2 is down only the neck pickup (passive) is heard

Knob 2: Bridge pickup volume. 
Down = Active, Up = Passive 
If this knob is up and Knob 1 is down only the bridge pickup (passive) is heard.
If both knob 1 and knob 2 are in the up position, both pickups (passive) are heard.

Knobs 3-5 are a 3-band EQ control:

Knob 3: Bass EQ. Functions with pickups in active mode.
Knob 4: Mid EQ. Functions with pickups in active mode.
Knob 5: Treble EQ. Functions with pickups in active mode.

"These basses give me everything I need for recording and playing live...all the tone, clarity, power, and feel¦everything. They are works of art and great tools for working bassists." - Gary Grainger