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Releases of Spectrum Analyzer

0.9.1.0 current version, released on: 2025-11-01

  • Fixed: Handling of selected channels for FFT-based visualizations.

0.9.0.0 released on: 2025-11-01

  • New: Radial Curve visualization.
  • New: Oscilloscope time-domain mode
    • Supports X-axis with time labels.
    • Y-axis none, dBFS and linear dBFS modes.
    • Only the selected channels are rendered.
    • Signal gain.
    • Optional phosphor decay effect with Gauss sigma and color decay factor setting.
  • New: Oscilloscope X-Y mode.
    • Supports X and Y-axis.
    • X and Y signal gain.
    • Optional phosphor decay effect with Gauss sigma and color decay factor setting.
  • New: Separate styles for X-axis vs. horizontal grid lines and Y-axis vs. vertical grid lines.
  • New: LED Mode has an *Integral Size* setting that will render the LEDs at full instead of fractional block sizes.
  • New: The configuration dialog will only show the styles that are used by the current visualization.
  • New: Support for semi and fully transparent Background styles.
  • Improved: Rendering stops when the host window gets minimized instead of the main window to improve behavior in foo_flowin.
  • Improved: Various little useability tweaks and fixes in the Configuration dialog.
  • Improved: Overall LED rendering fidelity and performance.
  • Improved: Spectrum curve stopped at the Nyquist frequency.
  • Improved: Small changes in the main processing loop to support delta-timing.
  • Changed: Upgraded rendering code from render targets to device contexts.
  • Fixed: Too few samples were taken into account during analysis (frame count vs. sample count). Thanks to TF3RDL for detecting and reporting it.
  • Fixed: Rendering bug in horizontally scrolling spectogram.
  • Fixed: Delay between playback and visualization. The backbuffer was not initialized.
  • Fixed: CQT transform did not handle audio with more than 1 channel correctly.

0.8.1.0 released on: 2025-09-26

  • New: The graph horizontal alignment setting has a new *Fit* option to make the Bar visualization use the complete width of the graph (minus the X-axis when enabled).
  • New: If the artwork can't be retrieved or is not available the stub image will be used.
  • Improved: The tooltip will only show the note name if the note's frequency falls within the frequency range of the spectrum bar.
  • Improved: Going forward older versions of the component will be able to read the configuration and preset files from newer versions in case you want or need to downgrade.
  • Fixed: Artwork not showing up when a track is already playing when switching to full screen. (0.8.0.0-beta2 regression)
  • Fixed: Restored compatibility with foobar2000 1.6.18.
  • Fixed: Spectrum bar top and peak size miscalculation. (0.7.6.2 regression)

0.8.0.0 released on: 2025-09-22

  • New: The album art type that is shown on the background can be selected in the configuration dialog.
  • New: The log verbosity can be set on the Common page of the configuration dialog.
  • Improved: Stability of album art rendering with multiple instances and heavy load.
  • Fixed: Rendering negative infinity in the peak meter readout was broken. (Beta 2 regression)
  • Fixed: Analyzer initialization after channel configuration changes.

0.7.6.2 released on: 2024-04-17

  • Peak Meter
    • Changed: Removed the 1/sqrt(2) correction from the RMS reading after a long discussion on the forum.

0.7.6.1 released on: 2024-04-17

  • Peak Meter
    • Fixed: The RMS text reading did not appear if the corresponding X-axis was disabled.
    • Fixed: Work-around for disappearing LED bars (Odd behaviour of FillOpacityMask())

0.7.6.0 released on: 2024-04-16

  • Peak Meter
    • Changed: Removed the 3.01 dB from the peak value.
    • Added: Option to allow the user to get readings compliant with IEC 61606:1997 / AES17-1998 standard (RMS +3).
    • Changed: Tweaked the coordinate calculations a bit to produce a more polished result.
  • Improved: The context menu will put a checkmark next to the last selected preset.

0.7.5.4 released on: 2024-04-13

  • Peak Meter
    • Changed: Swiched the unit from dB to dBFS.
    • Fixed: Some channel configurations (e.g. with side channels) were not displayed correctly.

0.7.5.3 released on: 2024-04-13

  • Improved: Peak Meter
    • Added style to display the peak and RMS values larger than 0dB.
    • Added style to display the top peak value.
    • RMS Window is now configurable. Defaults to 300ms. This makes the RMS value more stable. The RMS is relative to 0 dBFS + 3.01 dB.
    • The level values were not calculated correctly when the selected channels did not correspond to the channel configuration of the track.
  • Fixed: Overlap of the X-axis labels (Regression)

0.7.5.2 released on: 2024-04-10

  • Improved: Peak Meter
    • Calibrated the peak meter according to the IEC 61606:1997 / AES17-1998 standard (RMS +3).
    • Added style to display the RMS value as text.
    • Reduced jitter.
  • Improved: Increased the maximum amplitude to +6dB.
  • Improved: Optimized rendering the axes a little bit and tries to preserve the more imported labels.
  • Improved: Artwork fit mode can use the full component window instead of just the client area of the graph.
  • Fixed: Setting the LED size and LED gap both to zero caused the component to freeze.
  • Fixed: Artwork fit mode "Fill" was implemented backwards.

0.7.5.1 released on: 2024-04-06

  • Fixed: Peak Meter axes now behave as intended.
  • Fixed: Sample rate initialization and Nyquist frequency marker display when the component is used in a popup window.
  • Fixed: Disappearing artwork when the component is used in a popup window.

0.7.5.0 released on: 2024-04-04

  • New: Spectogram visualization.
    • Static or scrolling
  • New: Peak Meter visualization.
  • New: Built-in SoX color scheme and corresponding non-linear amplitude color map suited for the spectogram visualization.
  • New: The context menu can be used to load a preset.
  • New: Artwork Fit mode. Defaults to "Fit Big".
  • Improved: Double-clicking a preset activates it.
  • Improved: Edge cases for the scaling and position of the spectrum bars and curve vs. the X-axis.
  • Improved: LED Mode is also applied to the bar background.
  • Improved: The LED size and gap can be configured.
  • Improved: The font of the X and Y-axis can be configured in all visualizations.
  • Fixed: Privacy issue: The preset path will no longer be saved to a preset file.
  • Fixed: The spin buttons were not updated when switching between multiple graphs in the configuration dialog.
  • Fixed: Inconsistent state of the color buttons and values when switching between styles in the configuration dialog.
  • Fixed: User interface colors were not activated after loading a preset.
  • Fixed: The custom Solid color was not always saved correctly.
  • Fixed: Deadlock condition specific to CUI when playback was set to resume at startup.
  • Fixed: Memory leak in tool tips when resizing the component.
  • Fixed: Artwork should now consistently be rendered when requested.

0.7.4.1 released on: 2024-03-14

  • New: Amplitude-based color selection.
    • The colors of the spectrum bars can be set based on the amplitude of the frequency when using a horizontal gradient.
    • The colors of the current gradient are used to create a color list. Works with fixed, custom and artwork-based gradients.
    • Only the Bar Area and Bar Peak Area styles support this feature.
  • Improved: Gradient editing
    • Adding a color to a gradient will no longer recalculate the position of all colors. The added color will get a position between its predecessor and successor.
    • Removing a color from a gradient will leave all remaining positions untouched.
  • Fixed: The user interface colors and Windows colors were not consistently used and updated after the introduction of styles.
  • Fixed: Several minor fixes and tweaks to clean up inconsistencies and rough edges.

0.7.3.0 released on: 2024-03-09

  • New: Presets.
    • The configuration of the component can be written to and read from preset files (*.fvsa).
    • The default location of the preset files is the root of your profile directory but this can be changed.
  • New: Extra styles.
    • Bar Area: The new name for the Bar Spectrum style.
    • Bar Top: Defines the style for the top of the spectrum bar. Defaults to color source None for backwards compatibility.
    • Peak Area: Defines the style for the area below the peak indicator. Defaults to color source None for backwards compatibility.
    • Peak Top: The new name for the Peak Indicator style.
  • Improved: LED mode properly renders the 'LEDs' as blocks.
  • Improved: The font of the graph description can be specified.
  • Improved: Dark mode tooltips.
  • Fixed: Multiple controls were not updated when switching graphs in the configuration dialog.

0.7.2.0 released on: 2024-03-03

  • New: Analog-style spectrum analysis. Based on https://codepen.io/TF3RDL/pen/MWLzPoO.
  • Improved: Performance optimization. Rendering will stop when the main window is minimized.
  • Improved: Small performance optimization in SWIFT.
  • Changed: The grid lines can be displayed without an X or Y-axis.
    • X-axis and Y-axis mode "None" still disables everything.
    • The X-axis or Y-axis labels can be controlled with the top, bottom, left and right settings.
    • The X-axis Line and Y-axis Line style have been renamed to Vertical and Horizontal Grid Line.
  • Fixed: The style list box in the configuration dialog was not cleared before it was filled again after a reset.
  • Fixed (Regression): Gradient brushes are created again with the colors in the same order as shown in the configuration dialog.

0.7.1.0 released on: 2024-02-29

  • New: Sliding Windowed Infinite Fourier Transform (SWIFT).
  • New: Reaction Alignment parameter allow you to control the delay between the actual playback and the visualization.
  • New: The X-axis can be displayed on top, below or on both sides of the spectrum.
  • New: The Y-axis can be displayed on left, right or on both sides of the spectrum.
  • New: Option to enable or disable the rendering of the mirror image of the spectrum (Anything above the Nyquist frequency). Default is disabled.
  • New: Multiple graphs.
    • Each graph can be configured to show the analysis of one or more channels.
    • A graph can be flipped horizontally or vertically.
    • Graphs can be stacked vertically or on a horizontal line.
  • New: The style of the graph description background can be specified.
  • New: A marker for the Nyquist frequency can be enabled on the Styles page.
  • New: Context menu item to freeze and unfreeze the component.
  • Improved: Rendering and spectrum computation are not performed when the component window is hidden (to reduce the load on the computer).
  • Improved: The frequency tooltip tries to stay within borders of the component.
  • Improved: Tweaked the background painting again to prevent flashes when resizing the component.
  • Changed: Y-axis mode Logarithmic is now called Linear/n-th root.
  • Changed: To avoid confusion color source None for the background has been disabled until it can be properly implemented.
  • Fixed: Added some missing range checks in the configuration dialog that could lead to a crash.
  • Fixed (Regression): Incorrect background color during startup caused a bright flash in dark mode.
  • Fixed: The graph description will not be shown when it is left empty or when its color source is set to "None".
  • Fixed: The gradient brushes were not recreated when the graph was resized.
  • Fixed: X-axis scaling did not obey the selected scaling function.
  • Fixed: Most visual elements with color source "None" ignored the setting.
  • Fixed: The selected gradient color scheme was not activated after startup.
  • Fixed: Reversing the colors of a gradient did not recalculate the position of the colors. Instead it spread out the color evenly.

0.7.0.0 released on: 2024-02-12

  • New: The cover art of the playing track can be used as background image.
    • Opacity can be specified.
    • The dominant color of the cover art can be used as a filler.
  • New: The dominant colors of the cover art can be used to generate a gradient.
    • Color scheme "Artwork" turns on the feature.
    • Between 2 and 256 colors can be selected.
    • Lightness threshold determines which light colors will be ignored.
  • New: The Curve visual has a peak line.
  • New: Dark mode support.
  • New: Fading AIMP peak mode, a combination of AIMP and Fade Out mode.
  • New: Acoustic weighting filters (A-, B-, C-, D- and M-weighting (ITU-R 468))
  • New: Brown-Puckette constant Q transform.
  • New: Full Screen mode for Columns UI.
  • New: File path of the artwork can be specified as a file path or a title formatting script that returns a file path.
  • New: Styles. Moved all the fragmented visual parameters (color, opacity thickness) into one unified style system.
    • Upon first use the old settings are converted to styles and sensible defaults are set for the new features.
    • The "Draw Band Background" option has been removed. It has been replaced by the color source of the dark and light band color.
    • The "Artwork & Dominant Color" background mode has been removed. It has been replaced by the Dominant Color source.
  • New: The background and curve peak line and area can be styled.
  • New: Tooltips that provides some explanation about the various configuration settings.
  • Changed: X-axis mode 'Octaves' shows only 'C' notes; Mode 'Notes' shows all notes.
  • Improved: Curve mode can use a horizontal gradient.
  • Improved: The curve is no longer visible as a flat line when no track is playing.
  • Improved: Curve mode no longer has vertical lines at the beginning and the end of the spectrum.
  • Improved: The Curve line color can be specified.
  • Improved: The Curve Peak line color can be specified.
  • Improved: Bar width and peak indicator thickness get rounded to pixels for a more visually pleasing result.
  • Improved: Minor performance optimizations due to styles.
  • Improved: Optimized the calculation of the Curve visual.

0.6.0.3 released on: 2024-01-13

  • Improved: The sample window size for the FFT is now calculated based on the sample rate and the FFT size.
  • Fixed: The spectrum was not cleared after stopping a paused track.
  • Fixed: Wrong note names in the tooltip when using a non-default number of bands per octave.

0.6.0.2 released on: 2024-01-02

  • Fixed: Finally found a (the?) correct way to use the sample window duration of foobar2000.
  • Fixed: Frequency range specification when using notes.
  • Fixed: Code to determine Tooltip text.
  • Fixed: The Add button of the configuration dialog still displayed the old color dialog.

0.6.0.1 released on: 2024-01-01

  • Fixed: Bug fix for the broken improved DPI check.

0.6.0.0 released on: 2023-12-31

  • New: Curve visualization with customizable line width and area opacity.
  • New: The position of the custom gradient colors can be specified individually.
  • New: The color dialog can create colors with a specific opacity.
  • Improved: Added fall-back case for pre-Windows 10 1903 versions. Completely untested. Your mileage may vary.
  • Improved: Hardened the reading and writing of the configuration.
  • Improved: Various minor tweaks with focus on stability and future expandability:
    • The graph is drawn completely even when there is no track playing.
    • The peak indicators animation continues when the track stops playing or when it is paused.
    • The configuration dialog page is remembered.
  • Improved: The x axis shows labels for the complete specified frequency range.
  • Fixed: Crash when adding multiple instances to CUI (Columns User Interface) layouts.
  • Fixed: Removed background 'flash' when the element gets created.
  • Fixed: The spin controls of the Pitch setting used a wrong divider.
  • Fixed: Rewrote the handling of the spin controls to fix range checking and acceleration handling.

0.5.1.0 released on: 2023-12-14

  • New: Support for DUI and CUI default user interface colors.
  • New: LED mode.
  • New: The color scheme can be used as a horizontal gradient.
  • New: The color for the background of white and black 'keys' can be selected separately.
  • New: Galss window function.
  • Improved: Rendering occurs on a separate thread resulting in smoother animation.
  • Improved: Re-designed configuration dialog to fit on installations scaled higher than 100%.
  • Fixed: Some settings were reset when the configuration dialog re-opened during the same session.
  • Fixed: Scaling method was available when other than Linear distribution was selected.
  • Fixed: Bug in Median, RMS and RMS Sum summation method.

0.5.0.1 released on: 2023-12-08

  • Fixed: The low frequency was read twice from the CUI configuration.

0.5.0.0 released on: 2023-12-08

  • New: Columns UI support.
  • Fixed: Tooltips display at the correct position on installations scaled higher than 100%.

0.4.2.1 released on: 2023-12-05

  • Improved: Some internal tweaks and fixes.
  • Fixed: The default size of the configuration dialog was not initialized.

0.4.2.0 released on: 2023-12-03

  • New: Hovering over the spectrum displays a tooltip with the center frequency and the note name (when applicable) of the band over which the mouse hovers.
  • New: You can select which channels will be used during the transform in the configuration dialog.
  • New: You can select the window function that will be applied to the samples.
  • Improved: Made color scheme editing more resilient.
  • Improved: Added 30fps refresh rate.
  • Improved: The configuration dialog does no longer restrict the minimum size. You can resize it to any size no in case some controls are not accessible.

0.4.1.1 released on: 2023-11-29

  • Bug Fix: Resetting the configuration failed.

0.4.1.0 released on: 2023-11-29

  • New: Amplitude increment/decrement is configurable.
  • Improved: Some numeric controls are editable again. Range checking has been improved.
  • Improved: The high amplitude label and grid line on the Y axis are now fully visible.
  • Improved: Labels don't overlap anymore.
  • Fixed: The "Band Background" label was cut off.
  • Fixed: Range checking on some configuration panel controls.
  • Fixed: Content scaling should be DPI-aware now.

0.4.0.0 released on: 2023-11-26

  • New: Most colors and the custom color scheme can be modified in the configuration dialog.
  • Improved: Each instance of the component now has its own configuration. Note: The fullscreen version is a separate instance.
  • Improved: Added spin buttons to most numeric controls.
  • Changed: Mel scale mapping is now called Triangular Filter Bank scale mapping.

0.3.0.0 released on: 2023-11-20

  • New: Implemented a first version of a Constant-Q transform (CQT). Default is still FFT.
  • New: A custom FFT size can be specified in the configuration dialog.
  • New: A sample rate-based FFT size can be specified in the configuration dialog. The FFT size will be calculated based on the duration specified and the sample rate of the track being played.
  • New: Implemented Mel scale mapping of the FFT coefficients.
  • New: X-axis and Y-axis can hidden by selecting the "None" mode of each of the axes.
  • Improved: Added a versioning mechanism to the settings of the component. Unfortunate side-effect: Any configuration will be reset.
  • Improved: Tweaked the layout and the size of the configuration dialog a little bit.
  • Improved: Removed the client edge of the window for a cleaner look.
  • Fixed: The configuration dialog disabled the decibel settings when selecting a logarithmic Y-axis scale.
  • Fixed: Opening the visualization when a track was already playing did not show the spectrum.

0.2.0.0 released on: 2023-11-18

  • New: Implemented a configuration dialog.
  • New: Implemented logarithmic Y axis.
  • New: Experimental "Fade-Out" mode for the peak indicators.

0.1.0.4 released on: 2023-11-16

  • New: Implemented the color schemes.
  • New: Implemented the peak value indicators.
  • Improved: Replaced the FFT with one that supports complex values and non-radix-2 FFT sizes.
  • Improved: Improved and refactored rendering code.

0.1.0.3 released on: 2023-11-14

  • New: Implemented the frequency bands of [AveePlayer](https://aveeplayer.com/).
  • New: Implemented the smoothing methods of the spectrum.
  • New: Added some DirectX debug logging to the console. Set the "LogLevel" parameter to 1 to enable; Use 6 (default) to disable.

0.1.0.2 released on: 2023-11-13

  • New: The configuration is now read from a JSON file. Note: Not all parameters are implemented yet.
  • New: Implemented all frequency scaling methods.
  • New: Implemented all coefficient summation methods.
  • New: The X axis has 3 extra display modes.

0.1.0.1 released on: 2023-11-12

  • Fixed: Spectrum calculation used the wrong FFT size. A 440Hz A4 note now appears in the right place.
  • Fixed: Crash in 32-bit version.

0.1.0.0 released on: 2023-11-12

  • Initial release
    • Everything is hard-coded. Consider this an early prototype.