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 AB_LM by TBProAudio is a Virtual Effect Audio Plugin. It functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin, an RTAS Plugin and an AAX Plugin.
Product AB_LM
Developer TBProAudio
Price (MSRP)
49.00 €
Type / Tags Audio Analysis ToolLoudness Meter
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
Downloads Released
System Requirements
Windows XP SP3/VISTA/7/8/10
Downloads Released
System Requirements
Mac OS X 10.5+
Miscellaneous Information
Copy ProtectionKey File

AB_LM (AB Loudness Match) is a gain control which enables level matched and sample accurate A/B comparison of FX chains.


  • match pre and post-FX loudness.
  • match pre-FX loudness with reference level.
  • 3 loudness match modes: manual, auto and gain stage.
  • FX chain drive.
  • up to 256 sender/receiver pairs including auto channel set/link.
  • automatic latency measurement/compensation.
  • 6 measurement modes: RMS Sum, RMS Avg, EBU R128 SL, EBU R128 ML, VU, Max Peak.
  • adjustable RMS measurement window.
  • bypass AB_LM.
  • delta monitoring (sender receiver difference signal).
  • global activate/deactivate, match mode, ABFX, drive and delta monitoring.
  • 4 snapshot slots.
  • very CPU friendly.
  • large and easy to use GUI.
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