NES Audio : Classic effects in chipmusic briefly explained

https://www.youtube.com/watch?v=la3coK5pq5w

https://www.youtube.com/watch?v=zq04PsV4o4A

https://www.youtube.com/watch?v=6GI9gngTn_Y

https://www.youtube.com/watch?v=Jd6nyynuzio

https://www.youtube.com/watch?v=kl9v8gtYRZ4

https://www.youtube.com/watch?v=LEgoYUzwabI

https://www.youtube.com/watch?v=a2_FcMWu170

https://www.youtube.com/watch?v=4HWHneafZ8w

https://www.youtube.com/user/explod2A03/videos

http://retrogameaudio.tumblr.com/

http://ozzed.net/Make-your-own-chip-music.shtml

http://en.wikipedia.org/wiki/Nintendo_Entertainment_System_technical_specifications

http://www.nes-audio.com/

http://www.retrousb.com/product_info.php?products_id=34

http://famitracker.com/

http://www.delek.com.ar/deflemask

http://woolyss.com/chipmusic-chiptrackers.php

http://www.ymck.net/en/download/magical8bitplug/ (Free AU)

http://www.virtualcreations.de/en/audioplugins (Elite Reducer, Free AU)

http://www.plogue.com/products/chipsounds/

http://en.wikipedia.org/wiki/Chiptune