In Windows 7 the generic USB audio driver has been changed and
the audio input defaults to a 1 channel input with high gain for use with a microphone.
When using the soundcard installed in the ZED range some changes have to be made:
Go to Control panel > Sound
Go to Recording / microphone and select properties.
In 'Advanced' tab change from 1 channel/16 bit/44.1K to 2 Channel/16 bit/44.1K.
In 'Levels' tab reduce microphone gain to 3.