ALM 5.1 Light Edition
Audio Loudness and True Peak Meter VST, AU, AAX plugin
and standalone application, BS1770, EBU R128, ATSC and ARIB compliant

ALM 5.1 LE is a key component in your mixing workflow. Based on the ITU, EBU, ATSC and ARIB loudness standards, the software offers you full Loudness and True Peak Metering for Mono, Stereo and 5.1 channel formats featuring measurements for Momentary, Short Term and Integrated Loudness, with Loudness Range and Max True Peak Level.

For a higher resolution in the target zone you can use the +9 LU scale. For a higher dy- namic range use the + 18 LU scale. Both a value and a bar indicator are available for Loud- ness Range, so you can decide if your audio needs more dynamic compression. ALM 5.1 LE follows the host transport and you can restart the measurements pressing the reset button.
Plugin Features
  • Audio Loudness Meter VST, AU and AAX plugins;
  • Channel Formats: mono, stereo and 5.1;
  • Full compliance with Loudness standards : BS-1770 (rev.3), EBU R128, ATSC A/85 and ARIB specifications;
  • Complete loudness measurements using universal descriptors: Integrated Loudness (Program Loudness), Momentary Loudness, Short Time Loudness, Loudness Range;
  • Real-time metering for Momentary Loudness, Short Term Loudness and Loudness Range;
  • Variable colors for loudness descriptors, according to the comfort zone;
  • True Peak led indicator (calculated using inter-sample peaks that can be missed in quantization);
  • Real time statistics for Program Loudness, Max Short Term Loudness, Max Momentary Loudness and Loudness Range;
  • Correct measurements for all the usual sample rates: 44.1 kHz, 48 kHz and multiples;
  • Low CPU usage due to the plugin optimization.
Loudness Descriptors
  • Integrated Loudness (Program Loudness) – describes the long-term integrated loudness of an audio material from ‘start’ to ‘stop’;
  • Momentary Loudness – calculated with a time window of 400 ms;
  • Short Term Loudness – calculated with a time window of 3 s;
  • Loudness Range – loudness dynamic range from ‘start’ to ‘stop’ that helps you decide if dynamic compression is necessary;
  • Max True Peak Level – indicates the maximum value of the signal waveform in the continuous time domain (this value is calculated using inter-sample peaks that can be missed in quantization).
1. Integrated Loudness or Program Loudness (in LUFS or LKFS);
2. Short Term Loudness (in LUFS or LKFS);
3. Loudness Range (in LU);
4. Measurements are done using EBU, ATSC or ARIB specifications (you can change it in the Settings tab);
5. Time counter for the duration of Integrated Loudness and Loudness Range measurement;
6. Play/Stop button – shows you if the plugin is measuring or not. In the LE, the plugin is always following the host’s transport.
7. RESET all the measurements;
8. +18 or +9 Scale;
9. Real time Moment Loudness Meter;
10. Loudness Range bar Indicator;
11. Short Term Loudness indicator;
12. Peak Led indicator.
Loudness Metering
ALM 5.1 calculates the values for the most important descriptors specified by the standards (Integrated Loudness – Program Loudness, Momentary Loudness, Short Time Loudness, Loudness Range). You can also choose the scale for Momentary Loudness according to your needs.
There are two options that can be accessed in the Settings window:
The standard: EBU with reference level at -23 LUFS, ATSC and ARIB with reference level at -24 LUFS.
The scale: +9 LU for a good resolution in the reference level zone, and +18 LU for a bigger dynamic range.
Presets and color coding
For a better monitoring of the Integrated Loudness, ALM 5.1 uses a color code. This way, you will know how your program loudness fares compared to the accepted tolerance of each standard. The accepted tolerance zone is the range of loudness that is comfortable to the listener. Note that the Integrated Loudness may not be constant through the program. It can vary within a specific zone according to the content requirements.
The color of Integrated Loudness parameter is:
green- if the Integrated Loudness matches the standard’s specifications;
yellow- if it’s around the standard’s specification, but still you must turn the volume up/down;
red- if the material is annoyingly loud/soft.
If you choose to use the presets, the default threshold for the Short Term Loudness will be the one specified by each standard. You can select another value according to your own needs. The color of Short Therm Loudness descriptor is in accordance with the threshold from the Settings window. If the measured value is above the threshold, the SL is green and if it is beyond the threshold, the SL is red.
The second window of ALM 5.1 LE offers real time values of main loudness descriptors of your program:
  • Program Loudness
  • Loudness Range
  • Max. Short Term Loudness with TC position for the maximum value
  • Max. Momentary Loudness with TC position for the maximum value
  • Max. True Peak with TC position for the maximum value
You can choose between Loudness Metering Modes (EBU, ATSC and ARIB) and set the True Peak Limit (-1, -2, -3, -4, -6, -9, -10, -12).
Minimum System Requirements
Dual Core CPU with SSE2 support
Dual Core CPU (Intel or AMD) with SSE2 support
Windows 7
Available Formats
VST 2.4 universal binary
AU universal binary
AAX universal binary
VST 2.4 universal binary
AU universal binary
AAX universal binary
Try before you buy
You can download a free trial, without feature limitations.