Zero Sweep Filter & Subkeeper Saturator: Free Filter and Saturator Plugins
Stemwire has released Zero Sweep Filter and Subkeeper Saturator as pay-what-you-want freeware for macOS and Windows. Both plugins share a clean white-on-black interface and focus on solving one specific mixing problem without extra controls. You can download them directly from the Stemwire website with no account required.
Zero Sweep Filter
Zero Sweep Filter is a resonant filter built for fast frequency shaping. It offers low-pass, high-pass, band-pass, and notch modes with a single sweep knob that moves the cutoff frequency. A resonance control adds emphasis at the cutoff point, and a drive stage introduces subtle saturation. The plugin is designed for quick filter sweeps on synths, drums, or full mixes.
Subkeeper Saturator
Subkeeper Saturator targets low-frequency enhancement. It applies harmonic saturation only below a set crossover frequency, leaving the mids and highs untouched. A single amount knob controls the saturation intensity, while the crossover slider defines where the effect begins. This makes it useful for adding weight to basslines, kicks, or sub-heavy material without muddying the upper spectrum.
Formats and Requirements
Both plugins run in VST3, AU, and CLAP formats on macOS (10.13+) and Windows 10/11. They are lightweight, with no iLok or license manager needed. The pay-what-you-want model means you can enter $0 at checkout and keep the plugins royalty-free for commercial use.
Quick Facts: Zero Sweep Filter and Subkeeper Saturator are free to download from stemwire.io with no sign-up. They support VST3, AU, and CLAP on macOS and Windows and are licensed royalty-free for commercial projects.
Grab both plugins at the Stemwire store today.
FAQ
Is Zero Sweep Filter really free? Yes, it uses a pay-what-you-want model — enter $0 at checkout to download at no cost.
What formats does Subkeeper Saturator support? VST3, AU, and CLAP on macOS 10.13+ and Windows 10/11.
Can I use these plugins in commercial releases? Yes, both are royalty-free for commercial use once downloaded.