File:Nicolic tetrad.mp3

Summary

Nicolic tetrad 1-15/13-15/11-15/7, in TE tuning, created with Sonic Pi by this script:

define :tetrad do |c1,c2,c3,c4|
  d1 = 1.25
  d2 = 5
  t = 60.0
  t1 = t + c1/100.0
  t2 = t + c2/100.0
  t3 = t + c3/100.0
  t4 = t + c4/100.0
  a = 0.8
  r = 1.6
  play t1, amp: a, release: r
  sleep d1
  play t2, amp: a, release: r
  sleep d1
  play t3, amp: a, release: r
  sleep d1
  play t4, amp: a, release: r
  sleep d1*2
  r = 3.5
  play t1, amp: a, release: r
  play t2, amp: a, release: r
  play t3, amp: a, release: r
  play t4, amp: a, release: r
  sleep d2
end
tetrad 0.000, 247.099, 536.086, 783.185

recorded and saved as *.wav. Then cut and transformed into *.mp3 with Audacity.