Create plot and reproduce chord

chord.py

import pyaudio
import matplotlib.pyplot as plt
import numpy as np
PyAudio = pyaudio.PyAudio
from scipy.io.wavfile import write

def sound_wave(wave, fs):
    p = PyAudio()
    stream = p.open(format = pyaudio.paFloat32, channels = 1, rate = fs, output = True)
    stream.write(wave)
    stream.stop_stream()
    stream.close()
    p.terminate()
def save_wave(wave, fs, name):
    write(name, fs, wave)
    
fs = 44100 # sampling rate = 1/s
ts = 1/fs
duration = 2 # seconds
sampling_points = duration*fs

notas_freqs = {
    'do': 261.63,
    're': 293.66,
    'mi': 329.63,
    'fa': 349.23,
    'sol': 392,
    'la': 440,
    'si': 493.88
}

t = np.linspace(0.0, duration, sampling_points)
chord_waves = 0.3*(np.sin(2 * np.pi * t * notas_freqs['do'])).astype(np.float32) + \
              0.3*(np.sin(2 * np.pi * t * notas_freqs['mi'])).astype(np.float32) + \
              0.3*(np.sin(2 * np.pi * t * notas_freqs['sol'])).astype(np.float32)

plt.figure(figsize=[15,5])
plt.plot(t[:2000],chord_waves[:2000],'-+', )
plt.legend(["Acorde [do,mi,sol]"])
plt.savefig('chord.svg')

sound_wave(chord_waves.tobytes(), fs)
save_wave(chord_waves, fs, "chord.wav")