FREE JSFX Plugin: E-FlangerFX700 by Windows-G

[Windows]

I have created a dedicated flanger out of my chorus plugin for those who use flangers. E-FlangerFX700 is a flanger plugin that can be used to add sweeping movement, metallic resonance, or whooshing effects to tracks.

Features:
* Two LFO Shapes:
1. Triangle: has constant modulation speed so it produces less obvious volume pumping, giving a steady and consistent flanging sound.
2. Sine: has variable modulation speed so it produces more noticeable volume pumping, giving a dynamic and pumpy flanging sound.
* Delay (0–10 ms): Sets the base delay time for the LFO modulation. Short delays (0.1–2 ms) create a metallic flanging. Moderate delays (3–4 ms) produce less resonant, single-voice flanging. Longer delays (5–10 ms) produce spacious flanging with more noticeable doubling.
* Depth (0–100%): Controls how far the modulation sweeps above and below the base delay time; this is the intensity of the modulation. Lower values create narrower sweeps, resulting in a subtle, gentle flanging, while higher values create wider sweeps, resulting in a more intense flanging. At 0%, there's no modulation, while at 100%, the modulation uses the full range of the delay time.
* Rate (0–5 Hz): Controls the speed of the modulation. Lower rates create slow, gentle sweeping, while higher rates create rapid whooshing effects. If you are unsure of how to dial in tempo-synced Hertz values for the Rate slider, you can use my E-AudioUnitConverter plugin. It converts note values into milliseconds, seconds, and Hertz based on your chosen tempo: https://windowsg.gumroad.com/l/unitconverter
* Width (0–100%): Controls the stereo width by offsetting the phase relationship between the left and right channels. At 0%, the modulation pattern is mono (identical on both channels), creating a centered flanging. At 100%, the channels are maximally out of phase, creating a wide stereo flanging.
* Feedback (-99% to +99%): Controls the amount of the delayed signal that loops back into the delay buffer. Positive values (1% to 99%) create in-phase feedback, producing resonant flanging. Negative values (-99% to -1%) create inverted-phase feedback, producing hollower flanging. At 0%, there's no feedback loop. The slider range is limited to -99% to +99% as a safety measure to prevent the feedback signal from looping at full strength when it's at ±100%, which would cause the signal to build infinitely and create distortion.
* Dry (0–100%): Controls the level of the original, unprocessed signal. At 0%, the original signal is completely removed. At 100%, the original signal is at full level.
* Wet (0–100%): Controls the level of the flanged signal. At 0%, the flanging effect is completely removed. At 100%, the flanging effect is at full level.
Having separate dry and wet controls for a flanger lets you isolate and listen to the flanged signal, which helps you make more precise mixing decisions.
* Wet HPF (10 Hz – 20 kHz): Applies a high-pass filter to the wet signal only. The filter becomes active only when the frequency is set above 10 Hz. Use it to roll off low frequencies and focus the flanging on the mids and highs.
* Wet LPF (20 Hz – 21 kHz): Applies a low-pass filter to the wet signal only. The filter becomes active only when the frequency is set below 21 kHz. Use it to roll off high frequencies and create a darker flanging effect.
* Output Gain (dB): Sets the final output level of the plugin from -30dB to +30dB to compensate for volume changes.
* Bypass (Smooth): The GUI features a dedicated bypass button for toggling the flanging effect on or off without audio clicks. Available for automation as “Bypass (Smooth)” in the parameter list.
* Zipper-Noise-Free Operation: Advanced interpolation ensures no zipper noise during slider automation or real-time adjustments.
* Visual Feedback: Clear indicators show the selected LFO shape (Triangle or Sine) and the active status of the feedback control as well as the wet high-pass and low-pass filters.
* Minimal CPU Usage

There are audio demos on the Gumroad page.

Link: https://windowsg.gumroad.com/l/flangerfx700

This JSFX plugin can also be used in other DAWs through the open-source YSFX plugin. YSFX is available in VST3, AU, and CLAP formats for Windows, macOS, and Linux. Download YSFX here: https://github.com/JoepVanlier/ysfx/releases

E-FlangerFX700 (Windows-G).png

[Cuauhtli]

Thanks. Not really a flanger user, other than the obligatory jet fly-over sound on guitar but I'll check it out.

Forgot to write a review for the chorus but I like it. Real easy to find the sweet spot on it. The sine wave chorus was interesting. Guess I've never used a chorus with a sine wave because it was new to me, the way it accelerates and decelerates. But very cpu friendly. I stacked 10 of them on a track and the cpu usage (as displayed in Reaper) went up about 1-1.5%.

[Windows]

Thanks. Not really a flanger user, other than the obligatory jet fly-over sound on guitar but I'll check it out.

Forgot to write a review for the chorus but I like it. Real easy to find the sweet spot on it. The sine wave chorus was interesting. Guess I've never used a chorus with a sine wave because it was new to me, the way it accelerates and decelerates. But very cpu friendly. I stacked 10 of them on a track and the cpu usage (as displayed in Reaper) went up about 1-1.5%.

Nice, I like my plugins to be simple to use and I also work on optimising all of them so they use minimal cpu. Sure, sine wave is very dynamic and interesting. Glad you like it. Thank you for the feedback, I really appreciate it.

[Windows]

Hi, late in posting but I updated the plugin on 21st January, 2026.

Changelog:
1. Made GUI buttons backward compatible in older REAPER versions. As a result, the plugin graphics now compile correctly in older versions of REAPER without affecting newer versions. Also, this doesn't affect the underlying audio processing code of the plugin; the older and new version null 100% in a null test.