Looking for a transcription app or a player

Please, does anyone know of any voiceover accesible transcription software or a player for Iphones and ipads with the following features?
* Background playback so I will be able to use whatever notetaking app and at the same time control playback using bluetooth keyboard without having to switch between these two apps.
* Variable speed playback
* Hot Keys (such as "Play", "Stop", "Pause", "Rewind"...) using bluetooth keyboard whenthe app is used in the background.
* Rewind by one, two, five or ten seconds.
* Various audio formats support.
I do not need speech to text function, prefer manual typing.
Thank you for your help in advance.