Voice changer choppy effect

[SuperZombi]

I have a fairly powerful computer, but when processing, I get a choppy effect between chunks.
I tried increasing and decreasing the size of the chunks, but it does not help.

Now I'm changing pitch with librosa.pitch_shifter()

from librosa.effects import pitch_shift
...
def pitch_shift_callback(in_data, frame_count, time_info, status):
    pitch_value = 6
    audio_data = np.frombuffer(in_data, dtype=np.float32)
    shifted_audio_data = pitch_shift(audio_data, sr=44100, n_steps=pitch_value)
    out_data = shifted_audio_data.tobytes()
    return (out_data, pyaudio.paContinue)

...
p = pyaudio.PyAudio()
stream = p.open(format=pyaudio.paFloat32, channels=1, rate=44100,
        input_device_index=SETTINGS["INPUT_DEVICE"],
        output_device_index=SETTINGS["OUTPUT_DEVICE"],
        input=True, output=True,
        stream_callback=pitch_shift_callback,
        frames_per_buffer=2048)

But this choppy effect still appears, because I think so, between the chunks there are gaps a few milliseconds long, which takes resampling.

Does anyone know how this can be fixed? Help please.