Burmester Top Line Phono preamp 100 Owner's Manual page 17

LOAD_UP\r switches the input capacity or resistor (according to the equipped module) up
LOAD_DN\r switches the input capacity or resistor (according to the equipped module) down
GAIN_UP\r switches the input amplification up
GAIN_DN\r switches the input amplification down
OUT\r toggles the overall amplification between 0dB and +6dB
OUT_0DB\r switches the overall amplification to 0dB
OUT_6DB\r switches the overall amplification to +6dB
AUDOADJ_CAL\r starts the Auto Adjust calibration
AUDOADJ_ON\r switches the Auto Adjust on
AUDOADJ_OFF\r switches the Auto Adjust off
VUM\r toggles the VU-Meter settings between off – left – right - mono
TYPE\r shows the type of the unit
SNR\r show the serial number of the unit
VERSION\r shows the software version of the unit
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