Mute key doesn't mute USB audio

Joined
Jul 11, 2008
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Hi,
I'm using an usb audio device (toneport ux2) connected to my iMac. Everything works great, but I can not mute the sound by using the "mute key" on keyboard. However, the volume increase/decrease buttons do function.
Can anybody help me fixing his problem?

Thanks!
 

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