Ola dBucket Chorus & Vibrato – Chorus Pedal - Strymon


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Certified Organic.

When we set out to design Ola dBucket Chorus and Vibrato, we knew that we wanted to take a high-performance SHARC DSP and dedicate all of its horsepower to doing one thing—providing the most lush and organic chorus and vibrato sounds ever heard.

Ola dBucket Chorus & Vibrato

Chorus & Vibrato Workhorse.

Our hand-crafted, processor-intense dBucket algorithm delivers all of the warmth and sonic complexities of analog choruses and vibratos.

Couple that with true bypass, a favorite preset, stereo input and output, and a super high quality analog front end and output section, and you have yourself a versatile chorus and vibrato workhorse.


  • Normal Mode
  • Ramp & Envelope Modes
  • Ola and El Capistan Video
  • Audio Samples

    • Slow and Wide
      This clip starts with Ola in true bypass, and then employs the 'even-tempered' sophistication of the the three-delay-line Multi mode.
    • Muted Chorus
      Here we're using the single-line Chorus mode to add some smooth and subtle movement to the signal. The Tone control is set at about 10:00 for a darker chorus sound. At :18 the speed is increased to add more motion to the sound.
    • Spinning Multi
      Clip starts in true bypass, then engages with the speed at maximum in the Multi mode. At high speeds you can generate some very fast and pleasing spinning modulations. Speed is dialed back at :29 for a less frenetic sound.
    • Steady Vibrato
      Hypnotic pitch variations, slow undulations, sea-sick warbles, and frantic insanity are all possible with the vibrato mode. This clip goes for some slow and steady moderate motion.
    • Distorto-Chorus
      Ola is great with distorted signals. This clip starts in true bypass, then goes into Multi mode. The distorted signal is fattened up, with all the organic warmth you could ask for.
    • Luscious Swirl
      Clip starts in true bypass, then engages with the three-phase Multi mode. Deep, organic, and luscious chorus tones are easy to create.

  • Audio Samples

    • Envelope Mode
      In multi mode, the 'env' setting reacts to your playing by mixing in more effect as you play louder. This opens up dynamically expressive creative possibilities, allowing you to 'dig in' and open up the sound, or lay back and dry out. The response is created with maximum transparency and musicality.
    • Envelope Vibrato
      In vibrato mode, the Env setting reacts to you playing by increasing the speed as you play louder. In this clip we've set the MIX control at about 10:00 to create a rotating speaker kind of a vibe.
    • Ramp
      The ramp mode smoothly goes from dry sound to wet at a rate determined by the RAMP SPEED knob. The effect "ramps" in as the Ramp footswitch is engaged and the chords open up as the chorus effect comes in.
    • Ramped Vibrato
      The vibrato is introduced smoothly and naturally in ramp mode, coming in at a rate determined by the RAMP speed control and engaged with the Ramp footswitch. This feature was present on a classic blue vibrato stomp box that continues to build its cult following today.

Tone Shaping

  • Types
  • Modes
  • types2

    The Chorus type is a traditional single-delay-line chorus using our dBucket algorithm. It uses a logarithmic LFO type to create a deep chorus that makes a great transition from lush to pulsing as the speed is increased.

    The Multi type has three individual dBucket delay sections per channel to create a ‘studio’ chorus effect that handles a high wet mix without sounding warbly.

    The Vibrato type employs a sinusoidal-type LFO and a single dBucket delay line per channel to capture the essence of the original classic vibrato stomps.

  • modes2

    The Envelope mode causes the effect to react to your playing level. When Chorus is selected, the wet signal diminshes as you play louder and comes back in at lower playing levels. With the Multi type, the opposite effect happens. The wet signal increases as you play louder, and diminishes at lower playing levels. With Vibrato selected, the speed of the vibrato increases as you play louder, and slows down at lower playing levels.

    In Ramp mode, press and hold the bypass footswitch to ramp in the effect. Use the Ramp knob to adjust the speed of the ramping effect. The effect ramps more quickly as you turn the knob clockwise.


Press (+) for more info.
  • Front Panel Controls
  • Ins & Outs
  • Speed adjusts your chorus LFO speed.
    Depth adjusts your chorus LFO depth.
    Mix adjusts your wet/dry mix, allowing you to tailor the intensity of the modulation.
    Ramp | Env - In Ramp mode, adjusts the speed of the ramping effect. The effect ramps more quickly as you turn clockwise. In Env mode, adjusts the sensitivity to your playing. Effect reacts more strongly as you turn clockwise.
    Tone adjusts treble frequencies of the wet signal, with treble boost at max, treble cut at min, and flat at 12:00.
  • Left Input – Plug your instrument in here. Acts as a mono input when only one channel is being used.
    Right Input – Plug your instrument in here.
    Left Output – Connect to your amp, mixing board, etc. Acts as a mono output when only one channel is being used.
    Right Output – Connect to your amp, mixing board, etc.
    Power – Maximum 9 volts DC center negative, with a minimum of 250mA current.


Sound designer Pete Celi takes you on an in-depth tour of Ola.
  • In-Depth Demo Part 1
  • In-Depth Demo Part 2


  • Sound Design
  • Ins, Outs & Switches
  • Audio Quality
  • More
  • Sound Design

    • Hand crafted dBucket algorithm for highly accurate reproduction of every stage of an analog bucket brigade chip.
    • 3 modulation types (Single Delay-Line Chorus, Three-Phase Multi Delay-Line Chorus, Vintage Vibrato Circuit)
    • 3 dynamic modes (Normal, Envelope, Ramp)
    • Global Tone control for the overall color of your modulation
    • Mix control for dialing in the intensity of your modulation
    • Controllable Ramp speed and Envelope sensitivity
  • Ins, Outs & Switches

    • High impedance stereo input
    • Stereo output
    • Favorite footswitch for saving your favorite setting
  • Audio Quality

    • Super low noise, high performance 24-bit 96kHz A/D and D/A converters
    • 110dB signal to noise
    • +8dBu maximum input level easily handles instrument and line signals
    • 20Hz to 20kHz frequency response
    • Premium analog front end and output section
    • Super high performance SHARC DSP in a compact form factor
    • 32-bit floating point processing
  • More

    • True Bypass (electromechanical relay switching)
    • 9V center negative DC supply included, 250mA current draw
    • Strong and lightweight blue anodized aluminum chassis
    • Crafted with love in the USA


  • "If there's a pedal in the Strymon line that really showcases how in tune the company is with stellar products of yesteryear, it's the Ola."
    Premier Guitar