Kevin thanks so much for your common sense approach, this has been buggin me for ages and just took the audio into Audition, made the effect, well actually I could only speed it up to it’s value of 12% which left me a few seconds shy from my sped up clip which is when it gets even stranger, I then used the speed/duration effect in premiere on the audition audio, exported it and it worked! I’m so glad it did but still no Idea why, so very strange.