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User’s Manual Nightingale PRO 6 PCI Audio Accelerator
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Left-click the mouse to activate the output mode. As you can see, the "Multi-SPK"
mode is not enabled here(the light is dim):
How to adjust the volume of microphone
You have to use the microphone when enabling yourself of the "Echo" function. If
the microphone is on and is very close to the speakers, it will cause feedback
between the two. Also, unusual high frequencies or buzzing sounds might be heard
from the speakers. To avoid this, you have to adjust the volume of microphone in
both recording and playback. Sometimes you might have to adjust main and
Wave volume as well. Please left-click the mouse to adjust the microphone(MIC)
in both Volume and Recording Control.