The harmonicinterval module

User documentation is in “Intervalo harmônico”.

Here is a minimal lesson file:

header {
  module = harmonicinterval
  lesson_id = "a400df62-e007-4a1b-9057-cd05397e88a2"
  version = "3.1.4"
  title = "Seconds"
  intervals = [1, 2]
  test = "3x"
  test_requirement = "90%"
}

Additional variables you can put in the header. Click on the link to get an explanation: