If you're traveling on public transport or don't want others to hear the app's sound, switch on silent mode!:

  • Via app:
    My profile → ⚙️ (Settings button, top right corner) → Silent mode
    within lessons, in the menu in the top right-hand corner

  • Via web:
    ⚙️ (Settings button, bottom left-hand corner) → Further Options → Account settings → Lesson sound effects