Guys – thanks for the replies – I’ll try these things out!!
My audio background needs to be shed like a snake skin, I think!! I’ve been reading up on tolerances etc for audio and video and how the eye deals with distance etc – I think I need to be a little less exact, however I have found that I’m still not 100% with the the 1 frame difference – when dealing with drums, the eyes can tell!!
I’ve used to work arounds for now – 1 – making a few different start points on my audio mixes – a couple of frames different each time so I can pick the right one and if it’s still not right, I’ve used the delay FX and 100% mixed the audio, adapting the delay time to get it right. Not ideal but it’s a start… I’ll try your idea once this work has gone off to the client….!
Enjoying my FCP learning curve – thank you all for your help!!