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Spectrum Analyzer

By: pqyt

foo_vis_spectrum_analyzer is a foobar2000 component that implements a spectrum analyzer panel.

It is an attempt to recreate the foo_musical_spectrum component by fismineur and the Audio Spectrum project for foobar2000 64-bit.

Features
  • Fast Fourier (FFT), Constant-Q (CQT), Sliding Windowed Infinite Fourier (SWIFT) and Analog-style transforms
  • Multiple frequency range and smoothing options
  • Multiple graphs
  • Styling of all visual elements
  • Artwork background and color extraction
  • Supports Default (DUI) and Columns (CUI) user interface
  • Uses DirectX rendering.
  • Supports foobar2000 2.0 and later (32-bit and 64-bit version)

Requirements
  • Tested on Microsoft Windows 10 and later.
  • foobar2000 v2.0 or later (32-or 64-bit).

Current version: 0.13.0.0, released on 2026-10-11

Download

Change log:

  • New: Goniometer with a 1st order or 4-th order Linkwitz-Riley crossover filter.
    • Has a mono, RGB and Triband mode.
    • The crossover filter can be configured on the `Filters` configuration page.
  • New: *Gold* and *Triband* gradient.
  • New: `Reset on track change` setting to reset the FFT peaks when a track starts or stops. Useful when you set the fall rate to 0 dB/s. [Forum request](https://hydrogenaudio.org/index.php/topic,125031.msg1087330.html#msg1087330)
  • New: Compiled with foobar2000 SDK 2026-09-17.
  • New: Gradient stops can have color source `Solid`, `Dominant Color`, `Windows` and `User Interface`. [Forum Request](https://hydrogenaudio.org/index.php/topic,125031.msg1087413.html#msg1087413)
  • New: The channels in the configuration dialog can be reordered. [Forum request](https://hydrogenaudio.org/index.php/topic,125031.msg1087375.html#msg1087375)
  • New: You can modify the position of a gradient stop by clicking and dragging on the gradient control. The value will be constrained between the previous and next gradient stop position.
  • Changed: `Decay Factor` is now `Afterglow`, expressed in ms, and independent of the refresh rate. Use values between 80 and 150 ms to imitate the afterglow of an analog oscilloscope.
  • Breaking change
    • Artwork Fit Modes are now `Free`, `Fit largest`, `Fit smallest`, `Fit width`, `Fit height` and `Cover`. `Fill` has been dropped.
    • Extra setting `Allow upscaling` will upscale the bitmap while respecting any Fit Mode except `Free`. [Forum request](https://hydrogenaudio.org/index.php/topic,125031.msg1088426.html#msg1088426)
  • Improved: Optimized the render path of the oscilloscope and goniometer.
  • Improved: The file path of the fixed artwork path can contain Windows environment variables.
  • Improved: Curve visualization is 4 times faster.
  • Improved: Optimized the spectrum LED rendering.
  • Improved: Peak Meter, Bit Meter and Oscilloscope honor the channel order specified in the configuration dialog.
  • Fixed: Controls on the Graphs page were not always enabled or disabled correctly when the visualization changed.
  • Fixed: A 3-year old bug in the non-radix 2 FFT.
  • Fixed: 32-bit Bit Meter interpreted the audio sample as 64-bit.
  • Fixed: Enabling and disabling Bit Meter opacity mode did not reset the opacity of the bit styles.
  • Fixed: Axis settings were disabled for the peak meter.
  • Fixed: Some visualizations did not pick up changes to the user interface colors. (Regression)
  • Fixed: Vertical Grid style of the Oscilloscope visualization did not react to changes. (Regression)
  • Fixed: Spectrum LED rendering when using two or more graphs.
  • Fixed: Color sorting did not work completely correct due to a bug in the HSL to RGB conversion code.
  • Fixed: Peak Meter did not handle mono tracks correctly.

Supported systems: Windows 32-bit, Windows 64-bit.

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Tags: Columns UI panel, Default UI element, Peak Meter, visualization

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