Biblography

B. A. Shenoi, Introduction to Digital Signal Processing and Filter Design, John Wiley & Sons, 2005 

http://documentation.apple.com/en/logicexpress/instruments/index.html#chapter=A%26section=4

http://www.ti.com/lit/ml/sloa088/sloa088.pdf

http://audiogeekzine.com/category/tutorial/audio-effects-explained-series/

http://voices.yahoo.com/analog-vs-digital-synthesizers-basic-comparison-3884938.html