After buying two of these, I should have just bought one, I have found
that they no not have a C-Media chip.  This is the info I get from the
"lsusb" command, "Bus 004 Device 002: ID 04f3:0a11 Elan Microelectronics
Corp."  So I spent about $20 for two of them, and they are not right.
Save your money, keep looking.

Jeff

David Powell-Williams wrote:
> Eric:
>
> I don't see any other responses to your request for USB FOB source
> information, so here is where I got mine:
>
> http://www.geeks.com/details.asp?invtid=CL-USCM2&cat=SND
>
> The part number/description that was on this site for the units that I
> purchased was:
> "CL-SU4CH -- USB 2.0 to Audio Adapter w/Microphone Jack"
>
> However, I see they now carry only the CL-USCM2 units.
>
> In addition to Jim's warning about the physical difficulty of modifying
> these FOBs, I would add the comment that the internal sound chip must be the
> CM-108.  I can confirm that the CL-SU4CH contains this chip.  I cannot vouch
> for the CL-USCM2.  However, at $6.50 apiece plus shipping, it's not much of
> a gamble.
>
> If I can help you further, feel free to contact me off-list.
>
> Good luck!
>
> 73,
> Dave
> VE7MQ.
>
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