[evil_twin]

OK OK I've got it working sound free, it appears I was being an idiot.

Immediately on loading the program, before opening any tables at all, delete the sound. I assume the program only loads the sound when you open a table, so you need to delete the sound as soon as you run.

I realise that was probably pretty obvious to those who suggested deleting the sound, but somehow I managed to screw it up first time round and got the sound all the same.

Apologies for wasting peoples time, and many thanks for all your suggestions.