A JSFX automatic filter plugin for REAPER that features:

* Two Filter Slots (Filter 1 & 2): Each slot can be set independently to Off, a 12dB/oct high-pass filter, or a 12dB/oct low-pass filter.
* Two Routing Modes:
1. Parallel: Both filter slots (Filter 1 & 2) are simultaneously fed with the same dry signal to be processed independently, and then their outputs are blended back together using summing with -3.0 dB gain compensation.
2. Serial: Both filter slots are processed in series (one after the other). So the output of Filter 1 becomes the input of Filter 2.
* Lower Limit (Hz): Sets the lower frequency boundary of each filter's sweep from 10.0 Hz to 21.0 kHz.
* Upper Limit (Hz): Sets the upper frequency boundary of each filter's sweep from 40.0 Hz to 21.0 kHz.
* Position: Displays the current position of each LFO-driven filter within the defined lower and upper frequency limits as a visual reference.
* Q (0.1 – 10): Sets the resonance of the high-pass and low-pass filters to shape how pronounced the cutoff frequency is.
* LFO Shape: Choose from six LFO waveforms (Sine, Cubic S-curve, Triangle, Square, Ramp Down, and Ramp Up) per filter.
* Phase (0–100%): Adjusts the starting position of the selected LFO waveform per filter. Setting the Phase slider to 50% (180°) on symmetrical waveforms (Sine, Cubic S-curve, Square, Triangle) gives you the inverse of these waveforms. For asymmetrical waveforms (Ramp Down, Ramp Up), when Ramp Down is selected and the Phase slider is set to 50% (180°), it produces an inverse sawtooth wave; and when Ramp Up is selected and the Phase slider is set to 50% (180°), it produces a sawtooth wave.
* BPM Mode: Use host BPM or set a custom BPM from 1 to 960 per filter.
* Rate: Provides 22 rate divisions, from 4/1 (slowest) to 1/32 (fastest), including dotted and triplet options per filter. The rates are arranged in order of speed: 4/1, 2/1 D, 4/1 T, 2/1, 1/1 D, 2/1 T, 1/1, 1/2 D, 1/1 T, 1/2, 1/4 D, 1/2 T, 1/4, 1/8 D, 1/4 T, 1/8, 1/16 D, 1/8 T, 1/16, 1/32 D, 1/16 T, and 1/32.
* Depth (0–100%): Controls the intensity of each filter's frequency modulation across the defined lower and upper frequency limits. At 0%, no modulation occurs (the filter does not move); at 100%, the filter sweeps the full lower and upper frequency range.
* Dry/Wet Mix (%): Blends the unprocessed dry signal with the filtered wet signal from 0% to 100%.
* Output Gain (dB): Sets the final output level of the plugin from -35 dB to +35 dB to compensate for volume changes introduced by the automatic filtering.
* Advanced Host Sync: Each LFO phase is synced to the DAW timeline, and the plugin automatically re-syncs on playback start, stop, or when jumping along the timeline.
* GUI Filter Status Indicators: Show the active status of each filter slot and whether it is set to HPF or LPF.
* GUI BPM Readout: Displays the current DAW tempo for each active filter.
* GUI Pos Readout: Shows the real-time frequency position of each active filter in Hz as the LFO moves.
* GUI Bypass Button: A dedicated bypass button for toggling the effect on or off without audio clicks. Available for automation as "Bypass (Smooth)" in the plugin's parameter list.
* Zipper-Noise-Free Operation: Advanced interpolation ensures no zipper noise during slider automation or real-time adjustments.
* Minimal CPU Usage.
* 16 Factory Presets: The plugin comes with 16 factory presets that can be imported via the included RPL file. Instructions for importing the presets are provided in the "Installation & Preset Library Import" file included in the Gumroad plugin download.

You can grab it for $10. All future updates are free, just make sure to use a valid email so I can send future updates to you.

Listen to the audio demos below to hear what the plugin can do:

Email Support: info.windowsg@gmail.com

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Using This JSFX Plugin in Other DAWs:

If you want to use this JSFX plugin in other DAWs, you can do so using the open-source YSFX plugin.

YSFX is available in VST3, AU, and CLAP formats for Windows, macOS, and Linux.

Download your preferred version of YSFX from here (Click on "Assets" for the downloads to appear):
https://github.com/JoepVanlier/ysfx/releases

YSFX comes in two versions:

* ysfx-s FX (for JSFX effects).

* ysfx-s instrument (for JSFX instruments).

1. Open ysfx-s FX in your DAW,

2. Then click "Load", find your "E-AutoFilter300_Windows-G" file, and click "Open."

The JSFX plugin will now run inside the YSFX host, working perfectly in any DAW that supports VST3, AU, or CLAP plugins.

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