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


def slow_wave(wave):
    """this function returns a slow wave
    writen by Gilad"""
    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 = copy.deepcopy(wave)
    slown_wave.data = new_data
    return slown_wave


def lower_volume(wave):
    """this function lowers the vlume of the wave
    writen by Gilad The Great"""
    low_volume = []
    for i in wave.data:
        low_volume.append([int(i[0]/1.2), int(i[1]/1.2)])
    new_wave = copy.deepcopy(wave)
    new_wave.data = low_volume
    return new_wave