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3. GarageBand for iOS. https://www.apple.com/ios/garageband. Accessed 2 Aug 2020
4. iOS Application. Yinyueba. https://apps.apple.com/cn/app/yin-yue-ba/id989562871. Accessed 2 Aug 2020
5. iOS Applications. JamKoo-Live Performance Synth. https://apps.apple.com/app/jamkoo/id1457240484. Accessed 2 Aug 2020