HM Mastering hints at Jack Ü release in the near future Minneapolis-based company HM Mastering reveals 'projects coming up' on its Facebook page and lists Jack Ü as one of them, hinting at an imminent EP release. Related Posts: Silk City’s hiatus-closing single, ‘New Love’ with Ellie Goulding, has arrived Ellie Goulding confirms role in Silk City’s return