Neve 34128 channel amplifier

sensitivity controls:

outer ring: line level input
inner ring: mic level input
mic: selected: mic input
deselected: line input

ph: 180 degree phase reversal
treble shelving:+/- 15db cut and boost at 15Hz shelving to 0db at 1kHz
mid range shelving: +/- 15db cut and boost at 820Hz, 1.8kHz, 3.9kHz
bass shelving: +/- 15db cut and boost at 15Hz sloping to 0db at 1kHz
high pass filter frequencies range from;15, 47, 82, 150 Hz