Analog Octave Up with Switchable Fuzz

Octava is an all-analog octave fuzz / frequency doubler featuring an on-board low pass Filter control that allows you to achieve singing octave up tones anywhere on the neck, without adjusting your guitar’s tone control. A front-end Drive and gushing Fuzz circuit add signal power and easily convert Octava to shoegazey fuzz pedal capable of producing devastating, full-wave rectified distortion. Use the Blend knob to mix the octave up effect on top of your dialed-in drive.

Volume: Sets the overall output volume.
Blend: Mixes in the octave-up effect.
Filter: A low-pass filter tone knob. Sets the cutoff frequency of the low pass filter on the input of the Octave circuit.
Drive: Mixes in warm front-end overdrive by increasing the gain of the J-FET preamp stage.
Fuzz: Activates the fuzz circuit.

https://www.pigtronix.com/pedals/octava/