Quad LFO and Phase Expander

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  • Modular Grid - Quad LFO
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  • Quad LFO

    $260Four independent, analog LFOs in 8hp. Linear voltage control over frequency. Sine or square waveforms.

    The Quad LFO gives you four independent high quality temperature stable modulation sources. While audio rate analog oscillators famously sound more alive, the living quality of analog modulators is often overlooked. The Quad LFO has a totally analog sine core, for living, low distortion, accurate, and consistent sine wave outputs. However, if you need a square wave for a clock, to drive a logic input, or for another purpose, you can set one or more LFOs to a square with a jumper on the back.

    The Quad LFO provides linear voltage control over frequency, matching our perception of sub-audio rate frequencies. Each oscillator ranges from nearly stopped to around 23 Hz. It is designed for knob twiddling, with accurate potentiometers, aluminum knobs, and 1Hz easily reachable in the center.


    Power Consumption+12V 51mA
    −12V 51mA
    Frequency Range5+ minutes to 23Hz
    Input Range0–10V
    Input Impedance40kΩ
    Output Swing−5V–+5V peak
    Output Impedance1kΩ
    Output Drive2kΩ (min), 20kΩ+ (ideal)

    LFO Phase Expander

    $110Unlock the potential of the Quad LFO with the LFO Phase Expander. Each expander gives you three outputs that duplicate the LFO with a fixed phase difference. The first ranges from 0° to 180°, the second from 90° to 270°, and the last from 180° to 360°. Along with the original output, this gives you four phases of modulation. These are easily tunable to quadrature (all knobs centered), but also any arbitrary phase relationship. You can attach up to four expanders, one for each LFO, giving you up to sixteen modulation sources.

    A multiphase LFO is extremely useful for building rhythmic modulations, particularly when paired with analog logic, such as provided by Babel. Further, regardless of the waveform selected on the Quad LFO, the output of the Phase Expander is always a sine wave. This gives you the useful possibility of having three rhythmically related phases of an LFO synced to a clock signal.

    Other than rhythmic modulations, the most common use of a multiphase sine LFO is in creating panning and crossfade controls that sound correct using only one or more VCAs. This is useful in panning sounds back and forth, rotating a sound in quadraphonic space, creating Shepard tones, etc.

    Even when you don't have a specific need for exact phase relationships, a multiphase LFO gives you a convenient way to expand your pallette of potential modulators, adding three related but distinct waves.


    Power Consumption+12V 21mA
    −12V 21mA
    Output Swing−5V–+5V peak
    Output Impedance1kΩ
    Output Drive2kΩ (min), 20kΩ+ (ideal)