ePub file with audio no longer displays audio slider control

I have an ePub file exported from pages, and the audio files used to display with a slider to ff or reverse to audio stream. I just opened it the first time in awhile and I see the new version of the iBook reader no longer displays a slider for ff/rev when I play audio files. You hit play and that's it. It isn't very desirable behavior not to be able to ff or rev the audio once playing. Does anyone know why behavior changed and if there is a way to get the formerly default audio controls back?