Filter Friend 2 is the successor to its successful predecessor. And what an upgrade! We have added a large number of filter engines with associated Filter types. You can now choose from a Ladder Filter, Diode Filter, Sallen Key Filter or State Variable Filter, and no less than 25 kinds of powerful Filter types. You can choose from 25 different Low Pass, High Pass, Bandpass, Peak, Notch and Band Reject types.
