Valhalla Shimmer

Best for Ethereal decay and pitch shifting soundscapes

Come with uncle and hear all proper!   Hear angel trumpets and devil trombones.   You are invited!

ValhallaShimmer is an algorithmic reverb designed for BIG sounds, from concert halls to the Taj Mahal to the Halls of Valhalla.

All of the sliders have been designed to be tweaked in real time and have a smoothed response to avoid clicks when changing settings or automating the controls. At the same time, the algorithm has been highly optimized, so you get a huge reverb sound without straining your CPU.

Now updated to version 1.2.2 (Windows) and 1.2.5 (Mac)! VST3, signed & notarized Mac installers, Intel/M1 native Mac builds, signed Windows installers.


Plugin UI


Reverb Mode



Big Stereo

Medium Stereo

Small Stereo

The Reverb Mode has a large impact on the perceived size of the reverb and also impacts the reverb density, modulation depth, and the rate at which the pitch shifted feedback builds.

The mono control selects a mono-in, stereo-out reverberation algorithm. The Mono algorithm has a very large base size and can take a long period of time to fade in. This algorithm has a very high echo density with most settings of the Diffusion parameter.

This algorithm is the best for very large acoustic spaces, such as cathedrals and monumental spaces, as well as reverbs that slowly fade in and out. The Big Stereo algorithm has a very high echo density with most settings of the Diffusion parameter and selects a stereo-in, stereo-out reverberation algorithm with a very large base size.

This algorithm, in conjunction with a reasonable amount of feedback, is the best choice for traditional “hall” reverbs. It is also a good choice for pitch shifted feedback with a fairly fast build of harmonics. The echo density is lower than the Mono and Big Stereo algorithms but is still fairly high. This mode selects a stereo-in, stereo-out reverberation algorithm with a smaller base size than the Big Stereo mode.

This is a stereo-out reverb algorithm with a small base size. It can be useful in achieving small room sizes, chorused short ambiences, and other smaller reverb sounds. It can be more strongly colored than the other reverb modes and has a noticeably lower echo density than the other modes.

Pitch Mode







The Pitch Mode selects the type of pitch shifting used in the feedback loop of the reverberator.

This is the “classic” mode used for recreating the Shimmer sound found in many of the Eno/Lanois productions. The randomization used in the pitch shifting will create noisy sidebands in the feedback loop, which results in a sound that is reminiscent of a large orchestra. In this mode, the signal within the feedback loop is shifted upwards or downwards, with the pitch ratio determined by the Shift control.

This is a good setting for getting a rich, symphonic harmonic texture. Here, the signal within the feedback loop is shifted both upwards and downwards simultaneously, with up/down pitch ratios determined by the Shift control.

In SingleReverse mode, the signal within the feedback loop is shifted upwards or downwards, where the signal within each pitch shifted “grain” is reversed in time. This results in a smoother pitch shifting sound than the Single or Dual modes – less orchestral, more organ-like.

In DualReverse, the signal within the feedback loop is shifted both upwards and downwards simultaneously, where each pitch shifted “grain” is reversed in time. This mode is well suited for producing a pipe organ sound.

In Bypass, the signal within the feedback loop is not pitch shifted and is passed straight through without alteration. This is useful in creating more conventional reverb sounds, where turning up the Feedback parameter increases the decay time.

Color Mode




This controls the overall “tone” of the algorithm.

In the Bright Color mode, the reverberated signal can be “full-bandwidth,” depending on the setting of the High Cut control. There is no inherent high frequency lost in this algorithm. The resulting sound is more “hi-fi” or modern than the Dark color mode.

In Dark Mode, the reverberated signal has a large amount of high frequency loss, with the exact amount of high frequency loss varying depending on the Reverb Mode selected. The resulting sound is reminiscent of the classic digital reverbs of the 1970s and early 1980s, with steep cutoffs above 10 kHz.

Try the Demo

OSX Demo (Intel & ARM Macs): ValhallaShimmerDemoOSX_1_2_5

Windows Demo: ValhallaShimmerWinDemo_V1_2_2

The demo versions of ValhallaShimmer are identical to the full versions, except the reverb fades out and then back in every 45 seconds.


Sean Costello and Don Gunn walk through the modes and functions of Valhalla Shimmer.

Hear it in action

See what people are saying

“Any fan of big cathedrals, halls or arenas will love the detail and breadth of this reverb tool.”

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Audio News Room

“If you’re into ambient music, I would head towards saying this is an essential addition to your plugin bank”

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“Dreamy and ethereal reverb from the halls of Valhalla.”

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Black Ghost Audio

“It really shines . . . creating unique atmospheres and textures.”

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Current Version 1.2.2

Changes since 1.0.4:

  • VST3
  • Ready for Big Sur
  • Signed & notarized installers for Mac
  • Signed installers for Windows
  • 64-bit only (32/64-bit legacy builds available in user accounts)

ValhallaDSP plugins are self documenting. Just roll over the controls to read the tool tip on the bottom left of the plugin.

For each plugin, I also write blog posts (see below) with product overviews, tips and tricks. Here are the blog posts for ValhallaShimmer:


The Manual






Diffusion vs. PreDelay

Reverb Envelope

Modulation, Auto-correlation and Decorrelation

If you have questions, please head to Support.


  • Windows: Windows 7/8/10
  • Plugin formats: 64-bit VST2.4/VST3/AAX


  • Mac: OSX 10.8/10.9/10.10/10.11, macOS 10.12/10.13/10.14/10.15, macOS 11 Big Sur
  • Plugin Formats: 64-bit VST2.4/VST3/AAX/AU