У вашего броузера проблема в совместимости с HTML5
Its amazing what you can see from a tuners audio output. The reason I am not using FM modes in Quisk, is because the audio output from the tuner after being decoded is amplitudes, not really FM since we aren't probing the IF stage. I was however wrong on my statement regarding not transmitting much in certain areas. We wouldn't see that here, not on the decoded output, because of course when the FM audio goes quiet, the amplitude goes down (there's no modulation so it sees nothing there except just a little noise), and AM is much noisier so it looks like it's always constant.