Music app developer Smule today launched Smule Pass, a new cross-app subscription to connect all of its apps under a single premium plan. Previously, Smule users had to purchase individual subscriptions for its apps. With Smule Pass, you’ll now be able to pay once and have access to song libraries, unlimited storage, audio effects and instruments across its four main apps – Magic Piano, Sing! Karaoke, Guitar! and AutoRap. The unified plan should make it easier for Smule to drive cross-app interactions, such as recording a piano track for a song that another user sings in the karaoke app. Smule’s...

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