Tikigod,
Thanks for the interest in dolphins stuff!
Some months ago when the dolphin stuff was fresh, I contact Sergei a lot of times (he made the dolphins movement and wakes) about sounds, waypoints and contact report. But he said me that all he achieve is what we have now: ahead movement and wakes. Some time ago a good guy here (i don't remember who) contact me with whale sound to be implemented on the game. He just rename one sound on the game with the whale sound. And then we could listen whales on the hydrophone...
But we don't achieve to put this on dolphins. Maybe you can try and a new light can be on...
Cheers,
Rubini.