Apps to suppHands free transcriber apps?

Dear All, As a blind postgraduate research student based in the United Kingdom I am finding it impossible to find an accessible mp3 player that is still available that can be connected to a foot switch for hands free controll so that I can transcribe my research interviews effeciently. No Daisy/mp3 playercan be connected to a remote foot switch anymore to support those without sight (Plextalk and many other players had this facility in the past). Therefore, has anyone come across or had experience of mp3 player apps for the I phone that can be connected to a foot switch or voice commands to in order that I can transcribe these interviews easily myself? Kind regards, Steve.