oscillator.frequency.value = freq; oscillator.connect(gainNode); gainNode.connect(audioCtx.destination); oscillator.start(); gainNode.gain.setValueAtTime(1, audioCtx.currentTime); gainNode.gain.exponentialRampToValueAtTime(0.0001, audioCtx.currentTime + duration); oscillator.stop(audioCtx.currentTime + duration); } const beat = 60 / 100; document.getElementById("one").addEventListener("click", function () { playTone(2000, beat * 0.75); }); document.getElementById("a").addEventListener("click", function () { playTone(2000, beat * 0.25); }); document.getElementById("two").addEventListener("click", function () { playTone(2000, beat * 1); });