@maheeinfy: Yes, it does support bit-perfect output. Already verified with Apple CCK and many external DACs supporting up to 384KHz sample rate. Also, there's an option for fixing output sample rate or not, if you want. You can have ST-1 preview with your own setup. The free version provides...

Appreciate your posting. I'm the developer of SigmaTunes ST-1. Yes, I'm Peter Wayne. Just joined the community to collect and compile various users input on an iOS audio player. FYI. Just updated the ST-1 a week ago optimized for iOS 11 as well as iPhone X. Thanks.

Hello, My name is Peter Wayne. Glad to join the world most famous Hi-Fi community ! Thanks.