Cannot mock react-native-sound with Jest

When I try to mock react-native-sound with Jest I get the following error:

//PlayerService.js
import Sound from 'react-native-sound';

try {
  console.log('Sound: ' + JSON.stringify(Sound)); //Sound: {}
  _trackPlaying = new Sound('path', Sound.LIBRARY, error => { });
} catch (error) {
  console.log('error: ' + JSON.stringify(error)); //error: {}
}

//PlayerService.tests.js
jest.mock('react-native-sound', () => ({
  Sound: jest.fn((path, type, callback) => {

  })
}));

// package.json

{
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-jest": "^21.2.0",
    "babel-plugin-transform-flow-strip-types": "^6.22.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-flow": "^6.23.0",
    "flow": "^0.2.3",
    "jest": "^21.2.1"
  },
  "jest": {
    "modulePathIgnorePatterns": [
      "__mocks__/"
    ]
  },
  "dependencies": {
    "react-native-sound": "^0.10.4"
  }
}

Alternatively I've tried setting up a manual mock in a separated file (__mock__ folder) with similar luck:

//__mocks__/react-native-sound.js
const Sound = jest.genMockFromModule('react-native-sound');

Sound = (path, type, callback) => {
  console.log("mocked");
}

module.exports = Sound;

//__tests__/PlayerService.tests.js
jest.mock('react-native-sound'); // doesn't work

Any guidance or advice will be greatly appreciated. Thanks much in advance!