Unbelievably better than iTunes if you use USB output
Sound quality is amazing, it has "digital volume", and "analog volume" control becomes unavailable if you use USB output; I am using Grace m903 amplifier with Sennheiser HD 800.
It supports FLAC.
Sound quality of native AAC of iTunes is unbelievably better on Decibel; technically, iTunes uses floating point calculations to amplify a sound, and cant separate digital USB output from analogous.
Guys, you can make your app better and pricier!
Bambarbia about
Decibel, v1.2.8