Hi Dave thanks for the advice at the moment i have various timelines with footage thats all synced up to external sound which was synced with a clapper board., this is what i was given to work with. so we are talking here about sequences with various formats apple pro res 25 being the main which is good because i wont have to touch that, i just need to convert everything else to match the apple pro res 25fps but if i convert my video this will then cause issues with my sync sound when i bring the footage back in. another question, if i convert the video and then dump the original to another drive as a backup disconnect that drive my timelines should all reconnect to my new converted media, thus saving me a lot of time? then i just need to figure out the audio. What do you think? Thanks Emmet