Discover the Custom Backing Track If you have the BeatSync mod installed, you can have these songs automatically downloaded in-game and a custom playlist created for you of all of them automatically. 18 11 Alpha 62 hddifent 21:16 Invinity Rush () Lv. dll and pop it into your Rocksmith steam folder. Custom songs are the reason most people get Beat Saber to begin with. All in-game content and credits belong to Harmonix.