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Wave Driver Not Installed--full-duplex

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My story

1) I was using a cheap SmartLink 56K modem, works fine

2) Tried to install an external creative 5671 external modem, did not work

3) Now, I put the smartlink modem back in, not working either

 

the error was "Wave driver not installed",

i checked device manager, the audio driver is "full-duplex", see image.

 

I installed the creative 5671 usb modem on my notebook, works fine with VG.

The audio driver is "half-duplex".

 

It seems that VG requires "helf-duplex" audio driver. Now the question is, how do I change the driver to half-duplex? No idea how it became full-duplex.

post-2-1090191655.gif

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Just uninstall/remove everything (modem & wave drivers) and re-install the modem again.

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