27turn the knob counterclockwise past the center. To change the high-frequency content, follow the same procedure; turn the TREBLE knobright to add highs, left to diminish them.The Bass and Treble EQs in the Personal Mixer are both shelving type.There is +/-12dB of cut or boost available for each.Bass EQ - 160Hz shelvingTreble EQ - 9kHz shelving+12dB-12dB+12dB-12dB160Hz 9kHzMaster VolumeThe overall system volume is controlled by the M ASTER VOLUMEcontrol, not to be confused with the Channel Volume control. This isa digitally-controlled analog volume control. Turn it counterclockwisefor a full off setting. As a general suggestion, start with the MasterVolume knob at a low setting, about 9 or 10 o’clock to start. Raise thevolume slowly from that point to a comfortable level.Note: Always use caution when adjusting any audiosystem component to avoid potential hearingdamage.Button BehaviorsThere are various combinations of lighted and unlighted buttons on theA-16R Personal Mixer. Here is an overview:• Channel buttons have two LEDs, an upper and lower.The upper button is red and indicates that the Channelis selected. The lower button is yellow; it indicates thatthe Channel is muted. Channel buttons will light solidor flash.• The R ECALL button has one red LED. It flashes whenthe R ECALL button is pressed, indicating that you cannow select a Preset by touching any numbered button.• There is one LED in the G ROUP button. When theG ROUP button is pressed, the LED flashes. Thisindicates that you can now build or edit a Group.