Parker Fly Handbook page 9

Both systems have volume knobs:
The magnetic pickup volume is controlled by knob 3.
The magnetic circuit also has a treble-cut tone knob on knob 2.
The piezo volume is controlled by knob 1.
Push-pull knob 2 to control magnetic coil splitting.
To get the most acoustic sound from the piezo pickups, use a hi-fidelity
system, such as a PA, acoustic guitar amp, keyboard amp, or home stereo.
2
1
3