Tone2 has released a beta version of BiFilter v1.0, a free, stereo filter VST effect plug-in for Windows. It uses a high precision "direct form 2" filter model with a "ripple less than 1dB". It supports linear behaviour over the whole frequency range from less than 20 Hz up to 20000 Hz and brilliant, controllable resonance.

Features:

• 28 filter types:
  

  Lowpass 30dB Highpass 30dB Bandpass 15dB Notch Fat lowpass octave M-Shape Dual Formant Waldorv Lowpass Fat highpass Para bandpass Equalizer Vocals Vocal A Vocal U

  Vocal E Vocal I Vocal O Phaser Low shelf High shelf Fat lowpass Fat lowpass 7th Lowpass like Highpass like Elliptic Lowpass Elliptic Highpass Peak EQ wide Peak EQ tight

• 7 distortion types (anti-aliased):
  

  Bypass Hard clipping Tube amp Presence

  Wave wrapping Wave shaping Bit crushing

• Input mono/stereo; Output stereo.
• Ray-traced GUI.