With Prime's overlap feature, you can transition between two songs as they play at their normal volumes. This is great for songs with quiet starts and ends!
Click here to learn more about Prime: http://loopcommunity.com/prime
Available for free in the App Store.
Mac: https://apps.apple.com/us/app/prime-multitrack-app/id1289813088?mt=12
iPad/iPhone: https://apps.apple.com/us/app/prime-multitrack-app/id664688175