![]() Because of this small window, any low-level material will hardly move the meter, but maybe within the acceptable limits for the recording medium and the intended listening environment. One of the 'features' of a VU meter is that the top 50% of the physical scale displays the top 6 dB of dynamic range, but the meter’s useable dynamic range is only about 13 dB. The VU meter turned out to be a very primitive loudness meter, which approximates momentary loudness changes in program material but with the disadvantage of not being a peak reading meter. In the US, radio broadcasters were looking at the same issue but realized that PPMs would be very expensive to roll out across all the broadcasters so looked for a passive low-cost solution and settled on what we know today as the VU meter, which required a simpler meter movement and a single resistor, and so was much cheaper to implement. At around the same time, the German broadcasters were undertaking similar research, but because of the timing on the run-up to the second world war, could not collaborate with the BBC but both developed a similar peak reading meter, with a specially designed meter movement and an electronic circuit board required to produce a logarithmic scale. In the UK the BBC developed their peak program meter (PPM). In the late 1930s as radio broadcasting was being established around the world there was a real need for a reliable meter to display the signal being sent to the transmitter. Then we can better understand the 17 options and how to customise them to suit our workflows. This enables you to personalise the metering in Pro Tools to suit your preferences exactly.īut before we dig into the 17 different metering options available in Pro Tools, we need to take a brief look at the history of audio metering so help understand how we have got to this point, and a glossary to help understand the different terms used in audio metering. ![]() ![]() In the Metering tab of the Pro Tools Preferences window, you can adjust parameters including decay rate and depth, the reference point, integration time, and the breakpoints, where the colours will change on the meter display. Pro Tools Ultimate and Studio users have 17 different metering options, Pro Tools Intro and Artist users have only 4. In this article we take a detailed look at audio metering in general and the advanced metering available in Pro Tools Ultimate and Studio and show you what they look like side-by-side. ![]()
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