VuMeter

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Gale 04Jan16: ToDo-2 A Forum user has suggested some improvement to this page and made some associated feature requests - see http://forum.audacityteam.org/viewtopic.php?f=56&t=87227. I will deal with this at some point.
  • A user writing to feedback@ votes for EBU R128 plus Maximum short-term level not mentioned there. Shouldn't Maximum Momentary level be noted there?
VU meters  are meters to read a signal in volume units. This page has some single-vote suggestions to improve the Audacity VU Meters.
To vote for any items on this page, cut them from here and paste them with two votes into the Meter Toolbar section of Feature Requests.


  • The Audacity VU meters could be thought of as a hybrid between a VU and a PPM meter. Should we be using a standards-based VU or PPM meter instead?
  • positioned very near the record level control
  • phase-error indicator (if absolute averages of (L-R) > (L+R) then your inputs are probably out of phase)
    • What if you were recording with a true stereo microphone, I think the sounds on the Left would show an out of phase condition when both channels are compared. likewise the sounds on the Right side. (phase-error indicators are mainly to show if you have your inputs wired incorrectly).
    • Equation strictly is |L-R| > |L+R|, i.e. ignore the signs on the results. Hence for a blumein or similar crossed pair, this will only occur if the sound is outside the V of the pair of microphones at the side. This is equivalent to side on sound in a Mid / Side microphone setup. Either way the key thing is that mono listeners to the result will get little or no sound, which is very confusing. Any recording produced like this is likely to get a poor reception if played in mono.
    • An alternative implementation of this is based on an X-Y display of the inputs turned through 45 degrees, which will show horizontal or vertical depending on the phase of the inputs.
  • Given the above, maybe it should be possible to send the mix to the meters as well as the inputs to the meters. Very easy to cause by crossing leads inside balanced audio connectors.
  • As well as a peak meter, it would be very useful to have an RMS meter (as seen in Wavelab).
  • From the radio point of view a PPM meter is much more useful than the much slower VU type. This would be very useful. Currently use a freeware one , but would be much easier/better to have one built into Audacity.
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