title: Audio Effects for .NET: EQ, Reverb, Echo, and More description: Complete guide to audio effects in VisioForge SDKs. Includes volume, EQ, echo, reverb, compression, and more effects for cross-platform audio processing. sidebar_label: Audio Effects Reference

Audio Effects Reference¶

This document provides a comprehensive reference for all audio effects available in VisioForge SDKs.

Effect Types and Availability¶

VisioForge provides two types of audio effects with different platform support:

Cross-Platform Effects¶

• Platform Support: Windows, macOS, Linux, iOS, Android
• SDKs: Media Blocks SDK, Video Capture SDK (VideoCaptureCoreX), Media Player SDK (MediaPlayerCoreX)
• Implementation: Cross-platform audio processing
• Location: VisioForge.Core.Types.X.AudioEffects namespace
• Usage: Via AudioEffectsBlock in audio pipelines (Media Blocks SDK) or Audio_Effects_* methods (VideoCaptureCoreX/MediaPlayerCoreX)

Classic DSP Effects (VideoCaptureCore/MediaPlayerCore/VideoEditCore)¶

• Platform Support: Windows only
• SDKs: Video Capture SDK, Media Player SDK, Video Edit SDK
• Implementation: Native DSP processing
• Location: VisioForge.Core.DSP namespace
• Usage: Via Audio_Effects_* methods on SDK cores

DirectSound Effects (Windows Classic)¶

• Platform Support: Windows only
• SDKs: Video Capture SDK, Media Player SDK, Video Edit SDK
• Implementation: DirectSound/DirectX-based
• Location: VisioForge.Core.Types.X._Windows.AudioEffects namespace
• Usage: Via Audio_Effects_DS_* methods on SDK cores

Volume and Level Control¶

Volume¶

Availability: ✅ Cross-platform (Media Blocks, VideoCaptureCoreX, MediaPlayerCoreX) | ✅ Classic SDKs (Windows)
Audio Element: volume

Controls the volume level of an audio stream.

Properties: - Level (double): Volume level (0.0 = silence, 1.0 = normal, >1.0 = amplification) - Mute (bool): Mute flag

Typical Usage (Cross-Platform SDKs):

var effect = new VolumeAudioEffect(0.8); // 80% volume
effect.Mute = false;

// Media Blocks SDK
audioEffectsBlock.AddOrUpdate(effect);

// VideoCaptureCoreX / MediaPlayerCoreX
videoCaptureX.Audio_Effects_AddOrUpdate(effect);

Typical Usage (Classic SDKs):

// Handled through SDK audio volume properties

Amplify¶

Availability: ✅ Cross-platform (Media Blocks, VideoCaptureCoreX, MediaPlayerCoreX) | ✅ Classic SDKs (Windows)
Audio Element: audioamplify (Cross-platform)
DSP Class: Amplify (Classic SDKs)

Amplifies audio with configurable clipping methods.

Properties: - Level (double): Amplification factor (1.0 - 10.0) - ClippingMethod: None, Normal, or Soft (Media Blocks only)

Typical Usage (Cross-Platform SDKs):

var effect = new AmplifyAudioEffect(2.0); // Double amplification
effect.ClippingMethod = AmplifyClippingMethod.Normal;

// Media Blocks SDK
audioEffectsBlock.AddOrUpdate(effect);

// VideoCaptureCoreX / MediaPlayerCoreX
videoCaptureX.Audio_Effects_AddOrUpdate(effect);

Typical Usage (Classic SDKs):

// Add via Audio_Effects_Add, then configure
videoCaptureCore.Audio_Effects_Add(0, AudioEffectType.Amplify, "amp", true, 
    TimeSpan.Zero, TimeSpan.MaxValue);
videoCaptureCore.Audio_Effects_Amplify(0, "amp", 15000, false);

Stereo Processing¶

Balance¶

Audio Element: audiopanorama

Controls stereo balance (left-right panning).

Properties: - Level (double): Balance position (-1.0 = full left, 0.0 = center, +1.0 = full right)

Typical Usage:

var effect = new BalanceAudioEffect(0.3); // Slightly right

Wide Stereo¶

Audio Element: stereo

Enhances stereo width.

Properties: - Level (float): Widening amount (0.01 - 1.0)

Typical Usage:

var effect = new WideStereoAudioEffect();
effect.Level = 0.05f; // Subtle widening

Karaoke¶

Audio Element: audiokaraoke

Removes or reduces center-panned vocals.

Properties: - FilterBand (float): Center frequency (Hz) - FilterWidth (float): Frequency width (Hz) - Level (float): Effect strength (0.0 - 1.0) - MonoLevel (float): Center channel suppression (0.0 - 1.0)

Typical Usage:

var effect = new KaraokeAudioEffect();
effect.FilterBand = 220;
effect.FilterWidth = 100;

Delay and Modulation Effects¶

Echo¶

Audio Element: audioecho

Creates echo/delay effects.

Properties: - Delay (TimeSpan): Echo delay time - MaxDelay (TimeSpan): Maximum delay buffer size - Intensity (float): Echo volume (0.0 - 1.0) - Feedback (float): Echo repetitions (0.0 - 1.0)

Typical Usage:

var effect = new EchoAudioEffect(TimeSpan.FromMilliseconds(250));
effect.Intensity = 0.6f;
effect.Feedback = 0.3f;

Reverberation¶

Audio Element: freeverb

Adds room acoustics and spatial depth.

Properties: - RoomSize (float): Size of simulated room (0.0 - 1.0) - Damping (float): High frequency damping (0.0 - 1.0) - Level (float): Wet/dry mix (0.0 - 1.0) - Width (float): Stereo width (0.0 - 1.0)

Typical Usage:

var effect = new ReverberationAudioEffect();
effect.RoomSize = 0.7f; // Large room
effect.Level = 0.4f;

Flanger¶

Creates sweeping "jet plane" effect.

Properties: - Delay (TimeSpan): Base delay (1-10 ms typical) - Frequency (float): LFO rate (0.1-2 Hz) - PhaseInvert (bool): Invert phase of delayed signal

Typical Usage:

var effect = new FlangerAudioEffect(
    TimeSpan.FromMilliseconds(3), // Delay
    0.5f,                         // Frequency
    false);                       // Phase invert

Phaser¶

Creates phase-shifting modulation effect.

Properties: - Depth (byte): Effect depth (0-255) - Frequency (float): LFO frequency - Stages (byte): Number of stages (2-24) - Feedback (byte): Feedback amount - DryWetRatio (byte): Mix ratio (0-255) - StartPhase (float): LFO start phase (radians)

Equalization and Filtering¶

10-Band Equalizer¶

Audio Element: equalizer-10bands

Graphic EQ with fixed frequencies.

Band Frequencies: - Band 0: 29 Hz (Sub-bass) - Band 1: 59 Hz (Bass) - Band 2: 119 Hz (Upper bass) - Band 3: 237 Hz (Low midrange) - Band 4: 474 Hz (Midrange) - Band 5: 947 Hz (Upper midrange) - Band 6: 1889 Hz (Presence) - Band 7: 3770 Hz (Upper presence) - Band 8: 7523 Hz (Brilliance) - Band 9: 15011 Hz (Air)

Gain Range: -24 dB to +12 dB per band

Typical Usage:

double[] levels = new double[10] { 0, 3, 2, 0, -1, 0, 2, 1, 0, -1 };
var effect = new Equalizer10AudioEffect(levels);

Parametric Equalizer¶

Adjustable frequency, Q, and gain per band.

Properties: - Bands: Array of ParametricEqualizerBand (1-64 bands) - Frequency (Hz) - Q (bandwidth) - Gain (dB)

Typical Usage:

var effect = new EqualizerParametricAudioEffect(3);
effect.Bands[0].Frequency = 200;
effect.Bands[0].Q = 1.5;
effect.Bands[0].Gain = -3;
effect.Update();

High-Pass Filter¶

Audio Element: audiocheblimit (Chebyshev) or simple filter

Attenuates frequencies below cutoff.

Properties: - CutOff (uint): Cutoff frequency in Hz

Common Frequencies: - 20-40 Hz: Sub-sonic removal - 60-80 Hz: Rumble removal - 100-150 Hz: Clarity improvement

Low-Pass Filter¶

Attenuates frequencies above cutoff.

Properties: - CutOff (uint): Cutoff frequency in Hz

Common Frequencies: - 15000-20000 Hz: Gentle air reduction - 8000-10000 Hz: Warmth - 3000-5000 Hz: Telephone effect

Band-Pass Filter¶

Passes frequencies within a range.

Properties: - CutOffLow (float): Lower frequency limit - CutOffHigh (float): Upper frequency limit

Notch Filter¶

Attenuates a narrow frequency band.

Properties: - CutOff (uint): Center frequency to attenuate

Typical Usage: Remove hum at 50/60 Hz or feedback frequencies.

Chebyshev Band Pass/Reject¶

Audio Element: audiochebband

Steep filter with configurable characteristics.

Properties: - Mode: Band-pass or Band-reject - LowerFrequency (float): Lower bound (Hz) - UpperFrequency (float): Upper bound (Hz) - Poles (int): Filter order (2-12) - Type (int): Type I or Type II (1 or 2) - Ripple (float): Ripple amount (dB)

Chebyshev Limit (Low-Pass/High-Pass)¶

Audio Element: audiocheblimit

Steep low-pass or high-pass filter.

Properties: - Mode: Low-pass or High-pass - CutOffFrequency (float): Cutoff (Hz) - Poles (int): Filter order (2-12) - Type (int): Type I or Type II (1 or 2) - Ripple (float): Ripple amount (dB)

Dynamic Processing¶

Compressor/Expander¶

Audio Element: audiodynamic

Dynamic range control.

Properties: - Mode: Compressor or Expander - Ratio (double): Compression/expansion ratio - Threshold (double): Activation level (0.0 - 1.0) - Characteristics: Hard knee or Soft knee

Typical Usage:

var effect = new CompressorExpanderAudioEffect();
effect.Mode = AudioCompressorMode.Compressor;
effect.Ratio = 4.0;  // 4:1 compression
effect.Threshold = 0.6;
effect.Characteristics = AudioDynamicCharacteristics.SoftKnee;

Pitch and Tempo¶

Pitch Shift¶

Uses SoundTouch algorithm to change pitch without affecting tempo.

Properties: - Pitch (float): Pitch multiplier (0.5 = octave down, 2.0 = octave up)

Musical Intervals: - 0.5 = -12 semitones - 1.059 = +1 semitone - 1.122 = +2 semitones - 2.0 = +12 semitones

Scale Tempo¶

Audio Element: scaletempo

Changes tempo without affecting pitch (WSOLA algorithm).

Properties: - Rate (double): Speed multiplier (0.5 = half speed, 2.0 = double speed) - Stride (TimeSpan): Segment length (default 30ms) - Overlap (double): Overlap percentage (default 0.2) - Search (TimeSpan): Search window (default 14ms)

Typical Usage:

var effect = new ScaleTempoAudioEffect(1.5); // 50% faster
effect.Stride = TimeSpan.FromMilliseconds(25);

Tempo¶

Simple tempo change (may affect pitch).

Frequency Enhancement¶

TrueBass¶

Enhances low frequencies.

Properties: - Frequency (int): Upper frequency limit (Hz) - Volume (ushort): Amplification amount (0-10000)

Typical Usage:

var effect = new TrueBassAudioEffect(100, 5000); // Boost up to 100 Hz

Treble Enhancer¶

Enhances high frequencies.

Properties: - Frequency (int): Lower frequency limit (Hz) - Volume (ushort): Amplification amount (0-10000)

Advanced Effects¶

Dynamic Amplify¶

Automatic level adjustment.

Phase Invert¶

Inverts audio phase.

Usage: Useful for phase cancellation effects or correcting phase issues.

Sound 3D¶

Creates 3D spatial effect.

Properties: - Value (uint): 3D amplification (1-20000, 1000 = bypass)

Channel Order¶

Reorders audio channels.

Down Mix¶

Converts multi-channel to fewer channels.

Fade¶

Fade-in/fade-out effects.

Noise Reduction and Cleanup¶

Remove Silence¶

Audio Element: Custom implementation

Automatically removes silent sections.

Properties: - Threshold (double): Silence detection level (0.0 - 1.0) - Squash (bool): Remove completely (true) or reduce level (false)

Typical Usage:

var effect = new RemoveSilenceAudioEffect("remove-silence");
effect.Threshold = 0.05;
effect.Squash = true;

Audio RNNoise¶

Audio Element: audiornnoise (rsaudiofx plugin)

RNN-based noise reduction.

Properties: - VadThreshold (float): Voice activity detection threshold (0.0 - 1.0)

Typical Usage:

var effect = new AudioRNNoiseAudioEffect(0.5f);

Audio Loud Norm¶

Audio Element: audioloudnorm (rsaudiofx plugin)

EBU R128 loudness normalization.

Properties: - LoudnessTarget (double): Target in LUFS (-70.0 to -5.0, default -24.0) - LoudnessRangeTarget (double): Range in LU (1.0 to 20.0, default 7.0) - MaxTruePeak (double): Max peak in dbTP (-9.0 to 0.0, default -2.0) - Offset (double): Offset gain in LU (-99.0 to 99.0, default 0.0)

Analysis and Measurement¶

EBU R128 Level¶

Audio Element: ebur128level (rsaudiofx plugin)

Measures loudness according to EBU R128 standard.

Output: - Momentary loudness (LUFS) - Short-term loudness (LUFS) - Integrated loudness (LUFS)

HRTF Render¶

Audio Element: hrtfrender (rsaudiofx plugin)

Head-Related Transfer Function spatial audio.

Properties: - Azimuth (double): Horizontal direction (degrees) - Elevation (double): Vertical direction (degrees)

Specialized Effects¶

RS Audio Echo¶

Audio Element: rsaudioecho (rsaudiofx plugin)

High-quality echo from rsaudiofx plugin.

Properties: - Delay (int): Delay in milliseconds - Intensity (float): Echo intensity (0-1) - Feedback (float): Feedback amount (0-1)

Csound Filter¶

Audio Element: csoundfilter

Advanced audio synthesis using Csound.

Properties: - CsdPath (string): Path to Csound script file (.csd)

Platform: Requires Csound installation.

DirectSound Effects (Classic SDKs - Windows Only)¶

The following effects are available only in Video Capture SDK, Media Player SDK, and Video Edit SDK on Windows. They use DirectSound/DirectX technology.

DS Chorus¶

Availability: ❌ Media Blocks | ✅ Classic SDKs (Windows only)
Implementation: DirectSound DMO (Dynamic Media Object)

Creates a chorus effect with multiple delayed and modulated copies.

Properties: - WetDryMix (float): Dry/wet mix (0-100) - Depth (float): Modulation depth (0-100) - Feedback (float): Feedback amount (0-100) - Frequency (float): LFO frequency (0-10 Hz) - Waveform: Sine or Triangle - Delay (float): Base delay (0-20 ms) - Phase: Phase relationship for stereo (-180 to 180 degrees)

Typical Usage:

videoCaptureCore.Audio_Effects_DS_Chorus(0, "chorus", true,
    wetDryMix: 50, depth: 25, feedback: 25, frequency: 1.1f,
    waveform: DSChorusWaveForm.Sine, delay: 16, phase: DSChorusPhase.Phase90);

DS Distortion¶

Availability: ❌ Media Blocks | ✅ Classic SDKs (Windows only)
Implementation: DirectSound DMO

Adds distortion/overdrive to audio signal.

Properties: - Gain (float): Pre-distortion gain (-60 to 0 dB) - Edge (float): Distortion amount (0-100%) - PostEQCenterFrequency (float): Post-EQ center (100-8000 Hz) - PostEQBandwidth (float): Post-EQ bandwidth (100-8000 Hz) - PreLowpassCutoff (float): Pre-distortion lowpass (100-8000 Hz)

Typical Usage:

videoCaptureCore.Audio_Effects_DS_Distortion(0, "distortion", true,
    gain: -18, edge: 50, postEQCenterFrequency: 2400,
    postEQBandwidth: 2400, preLowpassCutoff: 8000);

DS Gargle¶

Availability: ❌ Media Blocks | ✅ Classic SDKs (Windows only)
Implementation: DirectSound DMO

Creates a gargling/tremolo modulation effect.

Properties: - RateHz (uint): Modulation rate (1-1000 Hz) - WaveShape: Triangle or Square wave

Typical Usage:

videoCaptureCore.Audio_Effects_DS_Gargle(0, "gargle", true,
    rateHz: 20, waveShape: DSGargleWaveForm.Triangle);

DS Reverb (I3DL2)¶

Availability: ❌ Media Blocks | ✅ Classic SDKs (Windows only)
Implementation: DirectSound I3DL2 Reverb DMO

Professional reverb with environmental modeling.

Properties: - Room (int): Room effect level (-10000 to 0 mB) - RoomHF (int): High-frequency room effect (-10000 to 0 mB) - RoomRolloffFactor (float): Rolloff factor (0 to 10) - DecayTime (float): Decay time (0.1 to 20 seconds) - DecayHFRatio (float): HF decay ratio (0.1 to 2.0) - Reflections (int): Early reflections (-10000 to 1000 mB) - ReflectionsDelay (float): Reflections delay (0 to 0.3 seconds) - Reverb (int): Late reverb level (-10000 to 2000 mB) - ReverbDelay (float): Reverb delay (0 to 0.1 seconds) - Diffusion (float): Diffusion (0 to 100%) - Density (float): Density (0 to 100%) - HFReference (float): Reference HF (20 to 20000 Hz)

DS Waves Reverb¶

Availability: ❌ Media Blocks | ✅ Classic SDKs (Windows only)
Implementation: DirectSound Waves Reverb DMO

Simplified reverb with basic parameters.

Properties: - InGain (float): Input gain (0 to 96 dB) - ReverbMix (float): Reverb mix (0 to 96 dB) - ReverbTime (float): Reverb time (0.001 to 3000 ms) - HighFreqRTRatio (float): HF reverb time ratio (0.001 to 0.999)

Typical Usage:

videoCaptureCore.Audio_Effects_DS_WavesReverb(0, "reverb", true,
    inGain: 0, reverbMix: -10, reverbTime: 1000, highFreqRTRatio: 0.001f);

Platform Availability¶

Most audio effects are available on: - Windows - macOS - Linux - iOS - Android

However, there are important differences between SDK types:

Media Blocks SDK / VideoCaptureCoreX / MediaPlayerCoreX (Cross-Platform)¶

All cross-platform effects are available on all platforms listed above.

Classic SDKs (Windows Only)¶

Video Capture SDK, Media Player SDK, and Video Edit SDK use Windows-only DSP effects.

Platform-specific effects: - Csound Filter: Windows, macOS, Linux only (requires Csound) - RS Audio effects: Requires rsaudiofx plugin - DirectSound effects (Chorus, Distortion, Gargle, Reverb, Waves Reverb): Windows only, Classic SDKs only

Effects Availability Matrix¶

Legend: - ✅ = Available - ❌ = Not available - Cross-platform SDKs = Media Blocks SDK, Video Capture SDK (VideoCaptureCoreX), Media Player SDK (MediaPlayerCoreX) - Classic SDKs = Video Capture SDK (VideoCaptureCore), Media Player SDK (MediaPlayerCore), Video Edit SDK (VideoEditCore) - Windows only

Audio Elements Reference¶

See Also¶

• Audio Processing and Effects - Block usage examples
• Audio Elements Documentation
• rsaudiofx Plugin