There was quite a bit posted on this subject in threads here weeks ago.
After reading this thread, I'll just point out some stuff, and then flee before the rocks and vegetables come out. I listened to all these vids. I don't hear anything here that departs from what I hear in game, except for the first one. That fellow seems to be using an EAX feature that adds depth or size to the environment. It's not overly dramatic, but its noticeable.
I'd guess he using one of X-fi cards.
What I'm going to point out here can be found elsewhere in this same site
--if you look for it.
In no particular order:
The setting on your audio slider can make a significant difference in the number and types of sounds you may hear. This has been coroborrated by others.
The slider has or had a defect which might now be corrected which did not allow a setting higher than 32 channels. The work-around is to change the associated settings in the config files --assuming your chosen sound system can support more. a 128 channel setting is possible.
I often hear birds. Crunchy footsteps in snow have never been absent for me.
I can tell you from personal experience that there is a HUGE difference in
ambience and depth betwixt a 7:1 Realtek on-board chip and most advanced PCI/PCI-e sound cards. I have both, and I've compared. No contest.
It is also entirely possibe to get sound from RO2 with a usb headset with
both your soundcard and/or your motherboard chip turned off. This proves the assertion that the RO2 sound engine is rendered through the cpu. But your slider setting and your chosen sound source will still make a vast diffrence in what you hear.
There ARE going to be big diffrences in each persons sound experience depending on what you choose to employ. Experiment. But I will assure you, that all these sounds are available with the kind of quality in those vids should you choose to take the steps to make them happen.
Now... Im going to step away quickly.