====== Ambisonics ======
https://en.wikipedia.org/wiki/Soundfield_microphone

PICTURES
  * https://www.google.com/search?q=diy+ambisonic+microphones&client=firefox-b&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjJqMa1i4LaAhXBPFAKHeqvCdMQsAQIkQE&biw=1280&bih=677

GENERAL + COMMERCIAL
  * http://www.ambisonic.net
  * https://www.creativefieldrecording.com/2017/06/07/the-unconventional-microphone-buyers-guide/
  * https://www.creativefieldrecording.com/2017/03/01/explorers-of-ambisonics-introduction/
  * http://www.core-sound.com/TetraMic/1.php (1st order)
  * http://www.core-sound.com/OctoMic/1.php (2nd order)

DIY
  * http://www.violini.de/
  * http://www.interestingelectronics.com/old/henrys_interesting_electronics/cheap_soundfield/cheap_soundfield.htm
  * Here are the detailed construction files, with 3D print models —> http://danh.coffeecup.com/ 

SOFTWARE (reaper, max, pd...)
  * http://www.ambisonictoolkit.net/
  * https://dxarts.washington.edu/wiki/ambisonic-mixing-reaper
  * http://www.ambisonictoolkit.net/documentation/reaper/tutorials/
  * https://www.zhdk.ch/en/downloads-5379 
  * http://forumnet.ircam.fr/product/spat-en/
  * https://github.com/CICM/HoaLibrary-Max
  * https://github.com/CICM/HoaLibrary-PD
  * http://rickygraham.net/?p=176401730
  * https://bitbucket.org/ambidecodertoolbox/adt
  * https://iem.kug.ac.at/projects/workspace/projekte-bis-2008/acoustics/awt/bin-ambi.html