價格：免費
檔案大小：128.8 MB
版本需求：需要 iOS 9.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
ARRA gives the possibility of applying immediately the arranging techniques hearing, seeing and comparing interactively the exercises made for this application. This app helps students to have a better understanding of the tools used for rhythm section before implementing them.
支援平台：iPhone, iPad