Frequency response requirements for headphones with CMSS on XFi ???

Hi,
I would like to know if someone could tell me what kind of heaphones are suitable for the CMSS mode with the XFi.
I mean between : flat response/free-field correction/diffuse-field correction.
Applying HRTF filtering should mean that headphones with flat response is the best option ( same configuration as binaural recordings).
But I have a big doubt that Creative team expects costumers to possess such a pair of headphones, as it is rather for scientific uses (psychoacoustics, audiology etc...).
So, if we look at the technical solutions for wide audience we have two options (FF correction and DF correction). Here is a trick because these corrections intend to reproduce some of the effects from HRTF (for two different environment configuration of HRTF measurements). It is why the frequency response of most of the headphones have a notch between 4Hz and 0 kHz.
To simplify, if we listen binaural sounds with classical headphones the effect of outer pinna is reproduced twice.
So I guess Creative have implemented a kind of normalization/equalization/correction process to deal with the non-flat frequency response of headphones, but do someone know if they have chosen diffuse field or free field correction ?
This post might seem a detail but the issue can be very important for the accurate localisation and the coloration? of 3D sounds with headphones.
Thank you, and please forgive my english!

The only possibility that I can think of is that 2/2. mode is NOT as simple as headphone mode with crosstalk cancelation. Perhaps the HRTF only kicks in for sound sources outside of the arc directly in front of the listener. If that were the case, you wouldn't percei've any distortion for sound sources in front of you.
Also, you are wrong regarding DirectSound3D. Keep in mind that Direct3D and DirectSound3D are not the same. The whole point of OpenAL and DirectSound3D is that they present an API to the programmer through which there is NO specification of the number of speakers. When using OpenAL or DirectSound3D, the only thing a programmer can do is specify the location of a mono sound source in 3D space relati've to the listener. The speaker settings for your DirectSound3D or OpenAL device will then determine how this sound is "rendered" by the soundcard. It is not under control of the game. For example, if you have 5. speakers and the 3D position is behind you, the SOUND CARD will make the decision to use the rear speakers. If you use headphones, the SOUND CARD will decide to apply an HRTF to create the illusion of a rear sound source. The point is that the game does not have control over how many speakers you will get sound from.
However, to further complicate the situation, there are SOME games (HL2 is an example) where DirectSound3D is used, BUT the sound output of the game itself IS a function of the Windows speaker settings. This is not how programmers are SUPPOSED to use DirectSound3D. I've written about this countless times. There is a good post on [H]ard|Forum about this. Do an "advanced" search with my username (thomase) looking for the terms "hl2" and "cmss".

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  • "The software required for communicating with the iPod is not installed..."

    I realize my explanation of my problem is long-winded, so if you want a shortened version, here it is:
    I've followed all the instructions trying nearly everything, and no matter what I do, iTunes gives me the error saying: "The software required for communicating with the iPod is not installed correctly. Please reinstall iTunes to install the iPod's software." My G5 iPod (60GB) works on two other computers (both without any music on them), so I assume there something wrong with my computer and not the iPod itself.
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    I just got the Generation-5 iPod Video (60GB) a today and I'm having problems already. I followed the instructions and installed the iPod software and then plugged in my iPod (iTunes has been on my computer for a while now). I was expecting iTunes to open after plugging in the iPod, but my device manager only detected and installed "a new device". I manually opened iTunes and got an error saying: "The software required for communicating with the iPod is not installed correctly. Please reinstall iTunes to install the iPod's software."
    After re-installing the iPod software and iTunes, and restarting my computer countless times, I came looking for help here. I found this page, which seemed to outline my problem exactly. My computer recognizes the iPod as a drive, but iTunes won't have anything to do with it. I have all the symptoms outlined in the heading, so I hoped to solve my problem there. I followed the instructions step-by-step, and after the final restart, I open iTunes to get the same exact error message.
    I decided to determine whether there was a problem with my iPod or if it was my computer. I plugged my iPod into my uncles's powerbook, and got to the point where I can name and configure my iPod. I expected it to work flawlessly on a Mac (which it did) but there is no way for me to continue using a Mac (after tomorrow) for my iPod. This formatted the iPod for a Mac, so I went to another (different from the original) Windows computer, clean of any iTunes and iPod software, and followed the instructions exactly as they're supposed to be followed. After the installations, I plugged in my iPod, and although iTunes didn't open, I was able to format back to Windows and name my iPod (a step in the right direction). I should note that my (anti-iPod) computer is a Windows XP Pro, and the working one is Windows XP Home Edition. This was all well and good, until I remembered there was no music on this computer. So my iPod is completely working there, but there isn't anything I can do with it.
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    Here are some other minor details that my be important, but I didn't feel they were worth including.
    - My brother has his iPod mini set up on my computer, under a different user login. He gets the same error once in a while, but re-installing iTunes always solves the problem for him. I had him try solving my problem his way, but nothing worked for him either.
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    Solution to "Software required for communicating with the iPod is not installed"!
    I battled this same problem for about 5 hours. Going through re-installations, the "5 R's", all these discussion boards. Nothing worked.
    The problem is that iPodService was repeatedly crashing after minute or so. You can verify this by hitting Ctrl-Alt-Delete and noting that iPodService is missing from the process list (sort by image name), or by right-clicking on My Computer and selecting "Manage", then going to Services and checking out the IPodService service - if it gives you the option to "Start", then it's not running.
    Here is what worked.
    1. De-install iTunes and iPod (if you have the updater installed) completely by going to Start --> Control Panel --> Add/Remove Programs. Also delete the C:\Program Files\iTunes and c:\Progam Files\iPod\bin directories. (Don't worry, this doesn't affect your saved music files.)
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    3.1 Go to Start menu --> Run.
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    3.4.2 On the window that launches, click on "Advanced..."
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    3.4.4 Select a valid account (the one you're logged in under) under "Change Owner To".
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    3.4.7 Click on the "Allow" checkboxes for "Full Control" and "Read".
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    3.5 Repeat procedure for the "iPodManager.1" key.
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    Apple support people: assuming this works, please add it to your solutions page, and feel free to reimburse me for spending half of Christmas figuring this out.
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  • SOLUTION to "Software required for communicating with the iPod is not insta

    Folks, I can not take credit for this.....you should send your checks to MarkinMadison. I've included his post in it's entirety. For me, this was the Holy Grail !!
    My only comment is make sure when you are in the registry that you hit the "apply" button to change and add things.
    This probably won't solve everyone's problem but it clearly solved mine (and I tried all other "solutions"), as well as Mark's.
    Apple: please find out who MarkinMadison is and either cut him a big check or offer him free Ipods for life.
    "Solution to "Software required for communicating with the iPod is not installed"!
    I battled this same problem for about 5 hours. Going through re-installations, the "5 R's", all these discussion boards. Nothing worked.
    The problem is that iPodService was repeatedly crashing after minute or so. You can verify this by hitting Ctrl-Alt-Delete and noting that iPodService is missing from the process list (sort by image name), or by right-clicking on My Computer and selecting "Manage", then going to Services and checking out the IPodService service - if it gives you the option to "Start", then it's not running.
    Here is what worked.
    1. De-install iTunes and iPod (if you have the updater installed) completely by going to Start --> Control Panel --> Add/Remove Programs. Also delete the C:\Program Files\iTunes and c:\Progam Files\iPod\bin directories. (Don't worry, this doesn't affect your saved music files.)
    2. Log in as an Administrator
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    3.1 Go to Start menu --> Run.
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    3.3 Go to HKEYCLASSESROOT --> IPodService.iPodManager.
    There are two keys here, iPodManager and iPodManager.1. In my case, I did not have permission to view either of these. I think this is the root cause of the problem. I think the installer can't properly update these because it doesn't have permission. So you need to change the permissions:
    3.4 Right-click on IPodService.IPodManager
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    3.4.5 Hit "OK".
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    3.4.6.1 Where it says "Enter the object names to select", type in the account name, e.g. "Smith".
    3.4.7 Click on the "Allow" checkboxes for "Full Control" and "Read".
    3.4.8 Hit "OK".
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    3.7 If you can't delete, you might need to open up the keys and repeat the procedure on the sub-keys.
    4. Exit out of the registry editor.
    5. Re-install iTunes. I re-installed iTunes and reconnected the iPod, and everything worked.
    I want to repeat that editing the registry can completely mess up your computer if you modify the wrong things, so only do this if you're comfortable, and be extremely careful.
    Hopefully this helps!
    Apple support people: assuming this works, please add it to your solutions page, and feel free to reimburse me for spending half of Christmas figuring this out.
    Mark"
    Dimension 4600   Windows XP  

    I have also posted the same question, earlier today. I purchased two for my children and cannot get the iPod to communicate with the computer. I have the iTunes software on my system, but during the installation process I cannot click the NEXT button, once I plug the iPod cable in. The computer does not detect it. I have tried all 6 USB 2.0 ports. I even removed the Dell Jukebox and MusicMatch programs. I am not a computer savvy person - just a mom who wants to give these to my children for Christmas. This is the first "chat" site I have even registered on. I am so very frustrated. Hopefully, this can be resolved.

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