A combination of a low pass and high pass filter, as well as a clean gain.
The low pass filter is a 12 dB per octave high frequency filter. The LPF knob controls the cutoff frequency and ranges from 20 kHz to 330 Hz.
The high pass filter is a 12 dB per octave low frequency filter. The HPF knob controls the cutoff frequency and ranges from 25 Hz to 190 Hz.
The gain control ranges from unity gain to +20dB.
The input impedance is 1MΩ, and the output impedance is 100Ω.
The pedal can be powered by a 9V battery or a DC power supply (not included). The DC supply should be a standard Boss style connector, center negative polarity. It can accept 9 to 24 volts. Although 9 volts is sufficient for most applications, higher voltages will provide more clean headroom when using the pedal with line level signals. The current draw is approximately 10 mA.
The Low + High Pass Filter has a true bypass switch. Dimensions: 4.77" long x 2.6" wide