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Yes. Most police carry such a device to enforce loud noise bands in many municipalities. Radio Shack (for one) sells a consumer version as well as most musical instrument stores. They are mostly just a microphone connected to an amp that has a meter or bar graph type display that is calibrated in sound pressure in db's. They need only to be pointed at the sound source to get a reading. If you held it up to your ear phones, you could measure the actual pressure being presented to your ears at any given volume level. Since the advent of portable sound devices, even before the I-pod, many young people have been damaging their hearing.
Assuming the USB is a line-out, you could get a usb, mini jack and then plug that into a headphone amp and use that for the volume control. Just have a try! And you will know how to operate.
Yes, but you have to connect the "audio port" from your cd burner to your motherboard header of the same port. Just have a try! May my answer help you!