「Best of App Store 2016」を受賞したアプリMedlyのシンプルなインターフェースには、スタジオで制作したような高いクオリティーを実現するアドバンスツールが搭載されています。まずは、17種類の楽器と100種類のループおよびサンプルが入ったスターターパックから始めてみましょう。Medlyメンバーを7日間無料で利用すれば、3000種類以上の楽器やループ、限定機能を試すことが可能です。
I think the confusion here is you believe Member is only about packs. But Member isn't about just packs, it's the full Medly experience. You can't buy packs individually because you don't have to buy Medly to use those packs. Medly is free to use, but the free version should be looked at as a limited free trial that you can use for as long as you'd like.
As to why subscriptions? We constantly update Medly, from new features and bug fixes, to new packs and new device support. Medly is constantly getting better. And rather than make versions of Medly that don't support the latest version of iOS or new devices Apple releases after a year or two (how software was sold in the past), we ask you pay a subscription, so you always have a functioning version of the app.
We also priced Medly Member accordingly, accounting for the fact that you can't keep using Member after you stop paying. Otherwise, the cost would be much higher.