createSound = (f, v) => {
var oscillator = context.createOscillator();
var gainNode = context.createGain();
gainNode.gain.value = v;
oscillator.type = 'triangle';
oscillator.frequency.value = f;
oscillator.connect(gainNode);
gainNode.connect(context.destination);
oscillator.start();
gainNode.gain.setTargetAtTime(0, context.currentTime, .03);
}