Prosoniq NorthPole AU

Prosoniq has released an AudioUnit version of NorthPole, a freeware 4-pole filter plug-in.

Many of our users have asked us to port our highly popular free NorthPole plug-in to the Apple AudioUnit format. We are happy to let you know that this is exactly what we did – today we’d like to introduce you to our brand new NorthPole AU that is available for download as of now. This selectable LP/BP filter plug-in brings back the sound of the analogue era to your AudioUnit production environment – still for free! Released as a VST plug-in in 1997 this filter got rave reviews all around the world and was the first free VST plug-in to be available. Enjoy the sound of the 90s today!


  • 24dB/Octave (4 pole)
  • Variable Cutoff + Resonance
  • Lowpass/Bandpass switchable
  • Envelope Follower with adjustable sensitivity
  • Envelope attack/release times
  • Adjustable analog distortion
  • Adjustable digital delay after filter with time, mix and feedback

You can still find the old download links (Windows and Mac) here.

Visit Prosoniq for more information.