G. FAT B - Adds a 3dB boost in gain on the B CHANNEL only.
H. VOLUME A - Controls the loudness of CHANNEL A.
I. VOLUME B - Controls the loudness of CHANNEL B.
J. TREBLE - Adjusts the overall brightness of the amplifier.
K. BASS - Adjusts the level of low frequencies through the amplifier.
L. MID - Adjusts the level of midrange frequencies through the amplifier.
M. SPEED - Adjusts the speed of the vibrato effect.
N. INTENSITY - Adjusts the intensity of the vibrato effect.
O. PILOT JEWEL - When this lamp is illuminated, the Dual Professional is receiving power.
Should this bulb burn out, unscrew the red jewel and replace the lamp with a type T47 light
bulb.