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: