Reverb effects are used in almost all music productions and for a variety of purposes. In everyday life, reverberation is the result of the many reflections of sound that occur in a given room or other space. In an ambient space, sound may travel directly to your ear and also be reflected many times off the walls and ceiling of a room before again reaching your ear. With each reflection, the sound is attenuated as sound energy is absorbed by the reflecting surfaces and dissipated by traveling through a medium (usually air). This collection of reflected and attenuated sounds is what we know as reverb.

Reverb provides essential aural cues about the nature of any given space. As such, reverb is commonly used in music production to create virtual spaces in which the various parts of a mix can interact.

Studio One features three built-in reverbs: Mixverb, Room Reverb, and OpenAIR. The following describes these reverb effects.


Mixverb is a simple and efficient reverb that is meant to be used as an Insert on mono or stereo Tracks. Mixverb features adjustable size, predelay, and damping, as well as an adjustable gate and stereo width control.

Mixverb offers the following parameters:

  • Predelay Adjust the predelay time. Variable from 0 ms to 500 ms. Predelay is the amount of time before the first reverberated signals are heard.
  • Size Adjust the relative size of the reverberating space. Variable from 0 to 100%.
  • Damp Adjust the relative amount of damping (attenuation of the upper frequencies) of the reverberated signal. Variable from 0 to 100%.
  • Gate The gate is applied to the reverb output signal.
    • Gate. Click to engage/disengage the gate.
    • Gate Thresh Adjust the threshold of the gate. Variable from -36 dB to 12 dB.
    • Gate Release Adjust the release time of the gate. Variable from 10 ms to 250 ms.
  • Width Adjust the width of the stereo field. Variable from 0 to 100%. Only for stereo Tracks.
  • Mix Adjust mix of processed signal with the original dry signal. Variable from 0 to 100%.
  • Lock Locks the Mix control in place.


[Screenshot] OpenAIR - OpenAIR plug-in editing window

OpenAIR is a highly efficient convolution reverb capable of delivering ultra-realistic reverberation based on impulses captured from both real spaces and classic hardware reverbs.

OpenAIR provides the following parameters:

  • Predelay Defaults to 0 ms; adds predelay to the impulse response with a positive value, or truncates existing predelay in the impulse response with a negative value. Values range from -150 to 300 ms.
  • Length For values smaller than the original impulse response length, this cuts the end (that is, shortens the reverb). For larger values, the range between the ER/LR (early reflections/late reflections) crossover point and the impulse response end gets timestretched. The beginning (up to the ER/LR crossover point) is not stretched, so the room impression created by the early reflections stays intact. [Ctrl]/[Cmd]-click restores the length to the impulse response length.
  • IR Display and Selection
    • Log Time When engaged, this shows more details for the early reflections, making it easier to set ER/LR crossover point.
    • Log Level When engaged, this makes it easier to see RMS curves.
    • IR Name Click to open file selector, or drag and drop any IR file here.
    • Prev/Next Switches the impulse response to the previous or next file in the same file location as the existing impulse response.
  • ER/LR Scales volumes before and after the ER/LR crossover point, from 0 to 1.00.
  • Gain Sets the overall output volume.
  • Mix This is the wet/dry mix, from 0 to 100%.
  • Envelope
    • Fade-In Fades in the impulse response, from 0 ms to 2.0 s.
    • ER/LR Crossover. Sets the crossover point in time for early and late reflections; affects the impulse response processing. Range is from 0 to 500 ms.
    • Fade-Out Fades out the impulse response, from 1 ms to the length of the impulse response.
  • Shorten with Stretch When this is activated, and the length is smaller than the original impulse response, the impulse response is not cut and is instead timestretched between the ER/LR breakpoint and impulse response end. (The content of the impulse response before the ER/LR breakpoint is not stretched or compressed, preserving the character of those reflections and thus a large part of the reverb character.)
    • Stretch with Pitch When this is activated, timestretching is not used for length changes, and resampling is used instead. This scales the early reflections as well.
  • Processing As OpenAIR does not feature true stereo processing, channel cross-feed and cross-delay is built-in.
    • Cross-Feed Adjusts the amount of the delayed “other” channel that gets fed into the left and right IR channels, from 0 to 100%
    • Cross-Delay Adjusts the delay of the cross-fed channels, effectively acting as stereo distance, from 0 to 25 ms.
    • Asymmetry Adjusts delays and the mix of cross-feed to simulate an asymmetric recording setup, from full left to full right.
    • 6-band Graphic EQ Scales frequency ranges in the impulse response.

Room Reverb

Room Reverb is a room simulator reverb that adjusts its internal reverb parameters based on virtual-room models. It is meant for use as a send effect or as a Main Output Channel effect. Room Reverb features variable room parameters and geometry, selectable room models, and population, damping, and surface-smoothness controls.

Room Reverb provides the following parameters:

  • Display Displays the overall reverb characteristics across a self-adjusting time scale. Early reflections are represented by vertical lines, and the reverb tail is represented by a colored envelope.
  • Pre Adjusts the offset for room-derived natural predelay amount. Variable from 0 ms to a higher value determined by current Room settings.
  • Length Adjusts the offset for room-derived natural reverb tail length. Value range is variable based on current Room settings.
  • Room
    • Size Adjusts the geometric average of the width, depth, and height of the virtual-room model. Variable from 1 m to 20 m.
    • Width Adjusts the width relative to size. Variable from 0.1 to 2.
    • Height Adjusts the height relative to size. Variable from 0.1 to 1.
  • Geometry
    • Dist Adjusts the relative distance between the source and the listener position within the virtual room. Variable from 0.1 to 1.
    • Asy Adjusts the left and right asymmetry between the source and the listener position. Variable from -1 (listener position far right) to 1 (listener position far left).
    • Plane Adjusts the relative height of the stereo source and listener position within the virtual room. Variable from 0 (half the height of the room) to 1 (ceiling).
  • Room Model Select a synthetic reverb model: Small Room, Room, Medium Hall, and Large Hall.
    • W, D, H Display Displays approximate room dimensions based on current Room settings.
  • Character
    • Population Adjusts the relative population of people in the virtual room. Variable from 0 to 1.
      • Value of 0 results in enhanced bass, “static” tail.
      • Value of 1 results in attenuated bass, “moving” tail.
    • Dampness Adjusts the relative humidity of the air in the room. This has the effect of attenuating the upper frequencies of the reverberated signal. Variable from 0 to 1.
    • Reflexivity Adjusts the relative smoothness of the surfaces of the virtual room. Variable from 0 to 1. Higher values evoke a more echo-like reverb tail.
  • Reverb Mix Adjust the mix of the reverb tail and early reflections. Variable from 0 to 1. Reverb display is updated to indicate this mix.
  • Dry/Wet Mix Adjust the mix of the Room Reverb signal with the original dry signal. Variable from 0 to 100%.
  • Perform/Quality Quality mode is selected by default. Engage Perform mode (economy performance mode) to use fewer CPU resources by disabling floor and ceiling reflections and reducing the calculation accuracy for the reverberation.


Studio One Version 4.5

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