Helpful Websites:
http://www.musicfromouterspace.com
http://yusynth.net
http://www.analog-synth.de
http://neoretro.jimdo.com
https://syntherjack.netÂ
https://www.allaboutcircuits.com
https://leshracslab.wordpress.com
http://www.hse-radio.de
Helpful Books:
