def memutza(sound1, sound2):
    return [int((sound1[0]+sound2[0])/2),int((sound1[1]+sound2[1])/2)]


def slow_wave(wave):
    new_data = []
    for i in range(len(wave.data)-1):
        new_data.append(wave.data[i])
        new_data.append(memutza(wave.data[i], wave.data[i+1]))
    slown_wave = wave
    slown_wave.data = new_data
    return slown_wave