import numpy as np
import sounddevice as sd
    phase = 90 * 2 * np.pi / 360

    sine_A = (np.sin(2 * np.pi * np.arange(self.fs * self.duration) * frequency / self.fs + phase)).astype(
        np.float32)
    sine_B = (np.sin(2 * np.pi * np.arange(self.fs * self.duration) * frequency / self.fs)).astype(np.float32)

    sumSine= np.array([sine_A, sine_B])
    sd.play(sumSine)

sounddevice.PortAudioError: Error opening OutputStream: Invalid number of channels