The Classic Auto-Filter by Kjaerhus Audio is one of the most pristine filters out there. It is very clean and straight to the point. This plug-in is a freeware with fantastic sound. There are many filters out there that cost a lot of money and do a lot of more cool tricks, this is a Classic Filter.
Once again the sound is phenomenal and with such an easy to use interface a twelve year old can use, it’s worth checking out. This acts like a real hardware filter and programmed accordingly.
A few minor setbacks would be the lack of presets. But if you’re an experienced sound engineer you will know this is not a problem for The Classic Auto-Filter. It offers all your basic filter types like LP HP BP and BR. The filter cut-off frequency can be modulated from the envelope follower and the LFO. The silk precision of the frequency knob makes this filter my most used tool.
In a nutshell if you’re looking to cutoff your baseline with a sick HP or to fade in your lead(s) with a classic LP envelope, this baby is for you.