Kjaerhus Audio has released the Classic Auto-Filter, an analog modeled four-pole filter with resonance control. It can be used for creative effects like auto-wah-wah and filter sweeps, as well as a fixed filter for equalizing purposes. The filter is selectable between low-pass, high-pass, band-pass and band-reject (notch). The filter cut-off frequency can be modulated from the envelope follower and the LFO.

Features:

• Modulated four pole filter with resonance.
• Syncable LFO with sine, random-hold and stereo spread.
• Envelope follower with adjustable attack and release.
• Presets.
• Very low CPU usage.
• Supports sampling rates on and above 44100 Hz.
• Full VST automation.

Classic Auto-Filter is free and is available as a VST plug-in for Windows.