twenty-seven

SOUNDS

• Very low frequency
  http://theinspireproject.org/default.asp?contentID=3
  http://theinspireproject.org/downloads/INSPIRE_VLF3_Rev1C_Assembly_InstructionsOnline.pdf
  http://theinspireproject.org/downloads/pdf/inspire%20Theory_of_Operations.pdf

• Delta Beats & Brain wave frequency
  https://hypertextbook.com/facts/2004/SamanthaCharles.shtml

• Sound Healing and tuning forks
  https://soundhealingtools.com/
  https://soundhealingcenter.com/store/instruments/tuningforks/

• What is the function of the various brainwaves?
  https://www.brainsync.com/brainlab/brain-wave-chart-.html
  http://fractalpanda.com/hack-your-mind-understanding-brainwave-frequencies/
  
  https://medium.com/@yelizruzgar/3-steps-to-spiritual-awakening-by-raising-your-brain-waves-to-gamma-11f93d66146a
  
  

CONTACT MICS
Piezo pickups and here
contact mic adapter
listen to your baby
how to calculate Hz of a heart beat Number of heart beats per minute divided by time in seconds 75 bpm = 1.25 bps = 1.25 Hz

earth sounds