Listening notes / Interval practice
Start with a small listening set
Make the question clear before making it difficult.
The practice room begins quietly. Generate a question, then press Play pair when you want to listen. Nothing starts automatically. The starter set contains minor thirds, major thirds, perfect fifths and octaves; you can choose a different set in the setup panel.
One decision at a time
A smaller set makes the choices easier to compare. Try two distances if twelve labels feel like too many. Apply setup, generate a question and listen to the same pair again before answering. Replaying the question does not mark it reference-assisted.
Use the guided fifth
The guided example explicitly plays C4 to G4, a perfect fifth. It is labelled and reference-assisted, so it is excluded from unassisted accuracy. Use it to learn the controls: play, choose an answer, read the result and generate another question.
Choose your own sound
Sine and triangle tones provide two simple synthetic timbres. The note-length setting changes how long each tone lasts. Volume starts at 20 percent in this app, and Stop interrupts any playing pair. The actual output also depends on your device and browser.
The room is an independent practice tool, not a course or a promise of a particular learning rate. For broader theory and exercises, explore musictheory.net or teoria.