Retired Document

Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.

Relevant replacement documents include:

http://developer.apple.com/library/mac/samplecode/sc2195/Introduction/Intro.html#//apple_ref/doc/uid/DTS40013969

FilterDemo

Last Revision:	Version 1.01, 2012-08-28 Analyzer errors are fixed. (Full Revision History)
Build Requirements:	Mac OS X v10.7 or later Xcode 4.3 or later
Runtime Requirements:	Mac OS X v10.7 or later

This project will build a simple Audio Unit effect and a Cocoa UI to go along with it. The effect is a simple resonant low-pass filter which has two parameters: cutoff frequency and resonance. It demonstrates how to implement a custom property for communicating information between the Audio Unit and its view. Also, it shows how to publish factory presets. The Cocoa view features a resizeable real-time display of the frequency-response curve which can be directly manipulated through a control point.