FAT Filter

FAT Filter is a super-smoth analog filter effect which was designed to keep the CPU hit as low as possible. 
Its only features are cutoff and resonance knobs, and a switch to choose between the low-pass and high-pass filtering modes. If you need any additional features like filter drive, modulation, slope adjustment, or input/output gain controls, FAT Filter is not the tool for you. One pretty decent alternative is FilterCrusher, a saturated filter effect which is available for free download via BPB. But if you’re only looking for a simple utility to filter out the lows and highs in your mix or create filter sweeps with the help of your DAWs built-in automation features, FAT Filter will certainly do the trick.

https://www.pluginboutique.com/products/3330