Pressing this once will engage the 75Hz high-pass filter (left Led illuminates).

The right LED is the dB peak warning light, which will illuminate red when the mic’s internal preamp is clipping, at which point the pad should be engaged. A final press will disengage both functions. A single press on this button will engage the -20dB pad (left LED illuminates), another press will engage the safety channel (left LED off, middle LED illuminates), and third press will engage both functions (left and middle LEDs illuminate). By default, the mic will auto-power on when connected to a device and power off when disconnected from a device, but you can also turn the mic on/off manually by holding this button for three seconds. The next button is the power/function control. You can use this to precisely tailor the output level to best match for your device.

The first is the infinitely variable gain control on the rear of the mic, which delivers a wide output range (numbered 1–15).