Short script for creating missing note samples detuning the ones you have.

filling_the_sample_gaps.py

!pip install librosa
import glob
import os
import librosa

def closest_sample(note, notes):
  absolute_difference_function = lambda list_value : abs(list_value - note)
  return min(notes, key=absolute_difference_function)

def detune(audio_file, semitone_steps, output_file):
    y, sr = librosa.load(audio_file, sr=16000)
    y_shifted = librosa.effects.pitch_shift(y, sr, n_steps=semitone_steps)
    librosa.output.write_wav(output_file, y_shifted, sr)

def audio_file_name(note):
  samples_folder = "samples"
  return os.path.join(samples_folder,f"{note}.mp3")

notas_con_samples = [48,52,56,60,64]

for nota in range(48,65):
  if not nota in notas_con_samples:
    nota_mas_cercana = closest_sample(nota, notas_con_samples)
    ruta_al_sample = audio_file_name(nota_mas_cercana)
    detune(ruta_al_sample, nota - nota_mas_cercana, audio_file_name(nota))