Ear training

Every question is synthesized on the spot with a faded amplitude envelope, so nothing clicks and nothing is recorded. Difficulty changes the exercise itself, not a label: the beginner level drills five consonant intervals upward within one octave with four choices, intermediate widens to nine intervals over an octave and a half with six choices, and advanced uses all thirteen intervals across three octaves with every interval offered as an answer. In equal temperament an augmented fourth and a diminished fifth are the same six semitones, so the quiz asks for tritone and stops there. This is a practice drill, not a hearing test: it cannot measure your hearing thresholds, and it deliberately teaches scale positions and semitone counts rather than song mnemonics.