Mad Filter
Key Features
- Morphs continuously among low-pass, high-pass, band-pass, and notch filter responses for evolving sweeps
- Combines filter shaping with a drive stage for warm saturation and stronger tonal color
- Triggers natural, complex LFO movement from the small controls above each main knob
- Provides two Go Mad randomization states for quickly generating more unpredictable movement
- Lets the filter type transition itself become part of the effect rather than a fixed mode choice
- Runs as a 64-bit AU or VST3 effect on macOS and Windows
Description
Mad Filter is a creative analog-style filter and drive effect from Rast Sound for adding movement, resonance, and saturation to audio tracks. Its central idea is filter morphing: instead of locking into one response, it can travel between low-pass, high-pass, band-pass, and notch behavior for animated tonal shifts.
The drive circuit is designed for warm, rich color, while the filter controls can move from gentle shaping to more pronounced sweeps. Small controls above the knobs trigger complex LFO motion, so a static synth, bass, drum loop, or vocal can take on changing rhythmic character without drawing every automation curve by hand.
Two Go Mad states add randomized variation for less predictable gestures. That makes the plugin most useful as a character effect: apply restrained drive and modulation for subtle life, or push both for unstable, electronic-style filtering.
Mad Filter uses a deliberately compact interface and is available as a 64-bit AU and VST3 plugin for macOS and Windows. The official Rast Sound product page remains live and shows a zero-price checkout flow, where the user adds Mad Filter to the cart before completing the download process.
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Frequently Asked Questions
What makes Mad Filter different from a standard filter plugin?
Mad Filter can transition between low-pass, high-pass, band-pass, and notch responses instead of treating them as isolated modes. That makes it suited to moving, hybrid filter textures as well as conventional sweeps.
How does the LFO movement work?
Small circles above the main controls trigger the plugin's natural, complex LFO motion. The Go Mad controls add a further layer of randomized variation when you want less repeatable movement.
Can Mad Filter add saturation as well as filtering?
Yes. Its drive circuit is part of the core sound design, so the effect can add warmth and density while the filter shapes the frequency content.
How do I get Mad Filter from Rast Sound?
Use the official Mad Filter page and select the zero-price Add to Cart option. The developer's checkout flow collects user details before the download is made available.
