A volume units meter (VU) indicates what leven your recording in or how high, low the level is. Sound is measured in decibels (dB). The ideal level for speech when recording is -18dB and -9dB. There are two sides to the VU, this is for the stereo output. Each time you go down a dB the percentage is halved. 0dB is 100% of the recording signal. An analogue can handle volumes above 0dB up to +9dB as soon as the signal hits 0dB the signal is very likely to distort making an unclear sound.
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