I find on "Analyzing" my project that the largest items by far are the sound files. I'm using .wav. Just tried mp4 video version which is much smaller and seems to work OK..- Seems odd using video for an audio file.. has anyone else used mp4 for video in pubcode?.
Or does anyone know of a better file format for good quality low sized audio please?

Found out that Mp3 is the best file format - and it is - by converting from wav to mp3 it's just halved the size of my project

I bring all my audio file into Adobe Audition and shrink them down. By changing the Sample Type in Export you can shrink the MP3's by up to 70%. Not sure about other audio programs.