An iOS and OSX audio framework built upon Core Audio useful for anyone doing real-time, low-latency audio processing and visualizations. It provides a universal API that provide cross-platform access to microphone input, reading and seeking through audio files (including compressed formats), recording, generic playback, and provides audio waveforms views that are CPU and GPU-accelerated.
The Official EZAudio Page:
http://syedharisali.com/projects/EZAudio/getting-started