What I have done is I taped the speaker opening on the back of the scanner with two stickers to reduce the beep volume to almost zero. So 3 to 4 stickers would probably eliminate the beep completely.
REGEDIT4
[HKEY_LOCAL_MACHINE\Software\Symbol\Notification\Object02]
"Volume"=dword:00000001
"Frequency"=dword:00000bb8
"Duration"=dword:000003e8
"Index"=dword:00000003
"Type"="BEEPER"
"Name"="Beeper"
Create a registry setting, putting volume to 0 will (almost) get of the sound ....
[HKEY_CURRENT_USER\Software\Symbol\SymbolPB]
"DecodeVolume"=2
"DecodeFrequency"=00FF
"InvalidDecodeFrequency"=0FFF
"DecodeDuration"=850
SOURCE: Types of Barcode that can be scanned using Symbol MC9090
It can read all standard symbologies apart from PDF symbologies unless it is equipped with an imager scan engine.
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