void inputActions(SDL_Event e) {
  switch (e.key.keysym.sym) {
    case SDLK_1:
      setSample(1);
      break;
    case SDLK_2:
      setSample(2);
      break;
    case SDLK_3:
      setSample(3);
      break;
    case SDLK_4:
      setSample(4);
      break;

    case SDLK_p:
      play = !play;
      step = 0;
      break;
    case SDLK_e:
      setErease = true;
      break;
    case SDLK_o:
      selectPattern = true;
      break;
    case SDLK_b:
      selectBank = true;
      break;

    default:
      break;
  }
}