Steps to reproduce:

1. Open attached project
2. Switch to iOS
3. Build for iOS and deploy to device
4. Click "Play1" or "Play2" to start playing the song
5. Notice that the song sounds "jumpy" (every few seconds the song seems to jump ahead a tiny bit)

Reproduced with:
2019.2.0a3, 2019.2.0a4

Does not reproduce with:
2019.2.0a2

Devices tested:
iPhone 6, iOS 11.3.1 (reproduced)
iPhone 6S Plus, iOS 10.3.2 (reproduced)
iPhone 7, iOS 11 (reproduced)
iPhone X, iOS 12.1.2 (not reproduced)