A nice straightener interface that deals easily with the music I've moved onto my NAS. It queues and plays well, and changes/adjustments are intuitive. No 'extra' stuff in the way, and the interface is consistent between my iPhone and my iPad. Supports multiple libraries in different storage locations so my wife and I can see and play each other's tracks without having to duplicate them redundantly.
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Download a free trial of MusicStreamer. Available on the App Store. The free version is restricted to 200 songs but allows you to try out all the features of MusicStreamer.