Back to overview Documentation version 8.50

  • Input amplification
    Amplifies or attenuates the input level before the BS412 limiter.

    This value should be chosen to amplify or attenuate the audio level such that it is just above the BS412 target level, to avoid stress on the BS412 limiter. Red line drops should be limited as much as possible (preferably no drops below -1 dB) and the green/pink line drops should not get below -2 dB too often, but the black line should be as close as possible to 0 dB.

  • Dynamics
    Controls the BS412 compressor target level, relative to Target maximum level (60 s).

    Setting this higher means that the compressor kicks in later, but may result in bigger slow volume changes.

  • BS412 Compressor upspeed
    Determines how fast the volume level is increased when the output level is low.

    When the output volume has been lowered due to too loud sounds, this slider determines how fast the output volume can be increased again. A higher value means that the average output level gets closer to the target level, but may also cause pumping. A low value may cause source material with big volume changes to come out too soft on average.

  • BS412 Compressor downspeed
    Determines how fast the volume level is decreased when the output level is too high.

    When the output volume would be louder than the set maximum + , this slider determines how fast the output volume is reduced. A higher value means that drops faster. A low value may cause the volume to be too loud for a longer period of time.

  • BS412 Remove remaining peaks above
    Cuts off remaining peaks above this level.

    The compressor responds slowly, this cuts off peaks that remain.

  • Volume drop speed
    Determines how fast the volume is dropped if it is too high

    BS412 requires that the total volume stays below a threshold in any 60-second period. If the input level is too high (higher than Target maximum level (60 s)) at any moment, it needs to be dropped. If this is done fast, the drop will be less deep, but for short bursts it will be bigger than needed. If the drop is slow, and the loud sounds last for a longer period of time, the drop will get deeper because the first part which is too loud needs to be compensated. So, if you broadcast audio with rapidly changing volume levels, a lower value (say, 2) might work better, for normal music a value around 3 should be fine. If you're going to broadcast constant tones, go for a higher value :) .

  • De-esser threshold
    Limits loud highs before the compressor.

    Reduces loud (pre-emhpasized) highs before they hit the compressor. This filter only responds if the total level would be too high.

  • De-basser threshold
    Limits loud bass before the compressor.

    Reduces loud bass sounds before they hit the compressor. This filter only responds if the total level would be too high. controls if in case of loud bass the total level is reduced (causing pumping) or only the bass (causing less bass).

  • De-basser pumping vs. bass reduction
    Chooses between bass reduction or pumping.

    If the bass gets above the threshold set in De-basser threshold, this slider controls if the entire volume should be dropped (causing pumping) or only the bass (resulting in less bass).

  • De-basser non-ITU.1770 compatibility mode (bad)

  • Pre amplifier
    Amplifies the signal before most of the processing occurs.

    Declipper, Link error '10182' and AGC if Gating based on volume before Pre Amp is enabled ignore this setting. If you want to correct a too low sound card input level, use Input gain instead.

  • Post amplifier
    Amplifies the output signal.

    This slider amplifies the output signal with a value after all the processing has finished. This is in effect a volume slider. If the Simple Clipper, Advanced Clipper and/or Hard Limit output is enabled, this value should not be set higher than 0.00 dB (x1.0). Don't allow above 0 dB can be set to enforce this. Otherwise, to avoid distortion, make sure that the output bar display is never completely filled: Too loud output means that the sound will be distorted.

  • Don't allow above 0 dB
    Limits Post amplifier at or below 0 dB.

    Normally, there's no good reason to set Post amplifier higher than 0 dB, except maybe when you're testing certain things.

  • Quick adjust: Loudness panel


    • Loudness

    Quick adjust: Texture panel


    • Attack/Release speeds

    • Density

    Quick adjust: Enhance panel


    • Lows density

    • Lows gain

    • True Bass

    • Bass Boost

    • Mids density

    • Mids gain

    • Presence density

    • Presence gain

    • Highs density

    • Highs gain

    Levels panel

    Input and output levels.

    Natural Dynamics panel


    Phase Rotator panel


    AGC panel


    AZIMUTH panel


    Stereo Boost panel


    ACR Stereo panel


    Equalizer panel


    Multiband compressor 1 panel


    Multiband compressor 2 panel


    True Bass panel


    Absolute Highs panel


    Bandpass filter panel


    Bass Boost panel


    Singleband compressor panel