import numpy as np


def create_audio(img, context={}):
    audio_length_seconds = 0.5
    time_axis = np.linspace(0, audio_length_seconds,
                            int(audio_length_seconds*44100))
    modulation = np.interp(time_axis, np.linspace(
        0., 1., img.shape[0]), img[:, 0, 0])
    frequency = 440 * (1 + context.get('freq', 0)/100.)
    audio_1 = (np.sin(2 * np.pi * frequency * time_axis))
    audio_2 = (modulation*np.sin(2 * np.pi * 300 * time_axis))
    return audio_1, audio_2