Hi there Kerry
You could one of the following options:
1) You can do a backup of your iphone before syncing so that way you won't lose any data and then be able to transfer your files safely.
2) If the files are not too big, you can send them straight to your email and then download it on your computer.
PS: Voice Memos from the iphone don't really record concerts that well since it tends to pick up a lot of noise so I'm not sure who would be able to help you in editing it.
I can't think of anything else of how you can transfer your files other than maybe idisk? But I'm not really sure