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Magesy® R-Evolution™

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    AB_LM v1.6.5 WiN MAC

    Team R2R | 04.10.2019 | WiN: 3.2 MB | MAC: 2.76 MB


    AB_LM is a gain control which enables level matched and sample accurate AB comparison of FX chains. Plugin (FX) or even a complex FX chain to the sound. Most DAWs can easily enable/disable (AB) single plugins or even whole FX chains, but in most case there is an audible loudness difference between both cases. In order to compare the impact of a plugin chain objectively the loudness of the incoming signal should match with the loudness of outgoing signal. Comparing the plugin effect at equal loudness levels avoids the “louder is better” – pitfall.

    Mode & Link Channel
    Sets the mode of the plugin, either Sender or Receiver and the link channel for the communication. Sender is placed before the plugin(s) which should be AB level matched, Receiver is inserted after.

    Latency Compensation
    Some plugins add latency to the plugin chain. For a sample-exact AB loudness comparison audio streams need to be synchronized. This can be done automatically (just press PDC button and wait 1-2 seconds) or manually by entering the latency value (in samples).

    Pre-FX Loudness
    This meter shows the current and maximum loudness of the audio stream just before the plugin(s). Many plugins work best at a certain loudness level (e.g. -18 dBFS)

    Post-FX Gain
    This meter shows the loudness difference of pre and post-FX signal. The match button lets you set the additional post-FX gain (match mode “manual”) based on current loudness difference. Match mode “Auto” does this automatically.

    Match Modes
    AB-LM lets you match the loudness either manually, or automatically.
    The mode “Gain Stage” works differently: The additional FX drive gain is just removed from magesy download the audio stream right after the FX chain for “pure” gain staging purposes.

    Snapshot Slots
    AB_LM provides 4 snapshot slots to store and recall settings for FX drive and Post-FX gain. So you can test your plugin chain with different gain levels, all loudness matched.

    FX Drive
    This parameter adjusts the additional pre-FX gain.

    AB Switch
    This button lets you seamless switch between pre and pre-FX audio signal.

    Pre-FX Gain
    This meter shows how close the loudness of the incoming signal is matched with a certain reference level. Many engineers work with loudness calibrated audio systems.


    • 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 16 sender/receiver pairs
    • automatic latency measurement/compensation
    • adjustable RMS measurement window
    • bypass AB_LM
    • 4 snapshot slots
    • very CPU friendly
    • large and easy to use GUI


    Changelog 1.6.5:
    – Small GUI changes
    – Info menu






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