https://techcrunch.com/2017/11/01/garageband-for-ios-gets-in-app-instrument-store-and-new-beat-making-machines/

A fancy new iPhone’s as good a reason as any to bring a big upgrade to Apple’s free music production service, GarageBand. The iOS version of the app is getting a slew of updates for 3.2, starting with a layout optimized for the iPhone X’s 458 ppi display.

The biggest bit of news for today’s free upgrade, however, is the addition of Sound Library — a long awaited feature that finally makes GarageBand’s instrument selection much more dynamic. It’s essentially an app store located within the app, wherein you can can download additional Sound Packs — which are either instruments or groupings of instruments like “Percussionists” or “Rock Drummers.”