func playNote(freq float64) {
	f := int(freq)
	p, _ := audio.NewPlayerFromBytes(audioContext, pianoNoteSamples[f])
	p.Play()
}
func playNote(freq float64) {
	f := int(freq)
	p, _ := audio.NewPlayerFromBytes(audioContext, pianoNoteSamples[f])
	p.Play()
}
// playNote plays piano sound with the given frequency.