My camera has no audio in so I bought off ebay (cheapskate) one of those Olympus digital voice recorders....I think it was about £20 and it was like new....but it has to be the type that comes with a remote lapel mic not all do.....this simply fits inside your headset ear cup and produces very clear digital audio ready for uploading onto your PC,
The model I use is the Olympus VN-480 PC .
Nick.