Electro-Harmonix Mainframe Bit Crusher Effects Pedal

Buzz. Beep and bloop. Get high on the lo-fi sounds of "old-school" games, toys and terminals!
The Mainframe provides sample rate reduction ranging from 48kHz to 110Hz. A little background the sample rate is the number of times per second that a sample or snapshot of an analog signal is taken. For example, CDs (remember them?) had a sample rate of 44.1kHz which means that the original analog signal is sampled 44,100 times per second.The sample rate defines the frequency range that can be reproduced while maintaining good fidelity. When the sample rate is reduced the quality of the audio is degraded and aliasing occurs. Aliasing means audible artifacts created when higher frequencies are sampled at an inadequate rate and the result is distortion. The Mainframe's sample rate range is wide enough to take you from sounds that are quite pristine to sounds that are unrecognizable when compared to the input signal.

It also provides bit crushing ranging from 24-bit to 1-bit. What does that mean? Bit crushing is bit depth reduction. Back to our CD example CDs used a 16-bit bit depth meaning that each of its samples was represented by 16-bits of information. Higher bit depths can accurately represent a greater dynamic range while bit crushing increases the number of sampling errors and creatively degrades the sound to bring us back to those nasty "old school" sounds we love.
The Mainframe's selectable High/Low/Band-Pass filter lets the user shape the artifacts of the bit crushing and sample rate. Another very cool feature is its Sample Rate Tuning Mode where the pedal analyzes your input signal in real-time and sets the sample rate to match the pitch of your signal, or a set interval above your signal. This allows you to set the sample rate to match the key of a song, or it will continually adjust the sample rate based on what you play!"
Exp/Preset Button and Green LEDTurns expression mode or a saved preset on and off. When the Green LED is lit, expression control is enabled, or the preset is enabled.
Filter HPF/BPF/LPF SwitchToggles the the filter: HPF: High-Pass Filter, BPF: Band-Pass Filter, and LPF: Low-Pass Filter.
Vol KnobThis knob sets the master output level.
Filter PeakControls the resonance of the Mainframe's filter.
Filter FreqThis knob controls the frequency of the filter.
Blend KnobThis knob blends between the dry guitar signal and the effect signal.
Bit Depth KnobAs this knob is turned clockwise, the bit depth of the signal is reduced, producing a distorted, noisy tone.
Sample Rate KnobAs this knob is turned clockwise, the sample rate of the signal is reduced, producing a ringing or glitchy tone.
Output JackThis 1/4" phone jack is the main audio output.
Input JackThis 1/4" phone jack is the audio input.
Exp Jack ConnectAn expression pedal or control voltage jack to allow for external control over every knob on the Mainframe.
Footswitch and Red LEDToggles between bypass and effect modes.