It never hurts to be able to get different perspectives on your audio, and this isn’t only a useful tool…it’s free, which is everyone’s favorite price. It’s generally best if the Correlation meter reading fluctuates between 0 and 1. These could be caused by an effect on a track that generates an out-of-phase output signal, stereo miking where the XLR cables were wired incorrectly (yes, it happens), or other gremlins. Although it’s not a problem to dip into the red (negative reading) from time to time, if the readings are often negative, then phase issues may be a problem. A correlation reading of -1 means the audio streams in the left and right channels are 180 degrees out of phase with each other (oops). A correlation reading of 1 means the audio is mono, or with stereo, that the audio in both channels is in phase.
Setting Scale to 6 can be a good way to trick yourself into respecting headroom a little more, because signals at -6 dBFS will show as 0.įinally, the Correlation meter indicates if there are any potential phase issues with stereo audio. Then, signals that hit -18 dBFS will register as 0 on the meter. For example, for 18 dB of headroom, set Scale to 18. Scale correlates peak levels to your preferred amount of headroom. Turning down Sensitivity for the slowest response provides a good way to compare average song levels, or sections within a song.
Turning up Sensitivity tracks the average level over shorter periods.
The Sensitivity control acts like a damping control on the meters, where lower sensitivity averages out the readings over a longer time period. Conversely, if the peak levels are high and the average levels are low, you may need some dynamics processing to even out the dynamic range somewhat. If the average levels are high compared to the peaks, then there may be too much compression or limiting being used. These can provide useful clues about your music. The LED meters in the middle indicate peak signal levels, while the VU meters indicate average signal levels. Grab it before someone at PreSonus decides they should probably charge something for it. Figure 1: This VU meter isn’t just free, it’s useful.
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