Sort of a hijack, but oh well...
A couple of months ago I met a guy at the pool that had a small waterproof MP3 player (that Oceanic housing is HUGE!). It automatically corrected the audio for listening underwater. He said that it sounded like crap out of the water, but sounded right while in the water. Now, for a project at work, I'm trying to find the device, and can't remember who he said it was made by. It wasn't the Oceanic, the Oregon Scientific MP-120, the Swimman, or the Finis SwiMP3. Anyone out there know of other models available? Oh, and yes, Ive done a google search. Several in fact.
The company I work for has a need for broadcasting messages underwater. In the past we have modified the audio files to be more intelligible before loading them on the player, but it would be easier if I could find a player that has built-in equalization.
On a personal note, I'm not planning on diving with one, but I, too, could see using it if I had to do long hangs. I can also imagine tropical dive shops putting together underwater audio tours, and renting out the players. How about diving on a WWII wreck while listening to a historical account of the ship and the battle? Or recorded instructions for underwater classes?
I would check out the Finis SwiMP3. The bone-conduction headphones sound promising. Ive read reviews on a brand with traditional headphones (maybe the Oceanic?) where the reviewer mentioned that the audio volume changed drastically at different depths (due to water pressures influence on sound velocity), so the diver was constantly fiddling with the volume. That shouldnt be a problem with the bone-conduction headphones.
The Oregon Scientific might be a good choice for swimming laps. It looks like it has ear plugs that would keep your ear canals dry, so you wouldnt have to worry about changing audio quality or volume.
As always, thats just my opinion.