you can kind of emulate 1. The knee is the way in which the compressor reacts to the signal. http://www.uaudio.com/media/assetlib...6ln_manual.pdf. The Ratio setting determines how much the compressor reduces or attenuatesthe signal. Think of it more like a synthesiser envelope where longer attack times produce a slower build up to maximum volume, or compression in this case, and faster times have a much quicker build up. ._9ZuQyDXhFth1qKJF4KNm8{padding:12px 12px 40px}._2iNJX36LR2tMHx_unzEkVM,._1JmnMJclrTwTPpAip5U_Hm{font-size:16px;font-weight:500;line-height:20px;color:var(--newCommunityTheme-bodyText);margin-bottom:40px;padding-top:4px}._306gA2lxjCHX44ssikUp3O{margin-bottom:32px}._1Omf6afKRpv3RKNCWjIyJ4{font-size:18px;font-weight:500;line-height:22px;border-bottom:2px solid var(--newCommunityTheme-line);color:var(--newCommunityTheme-bodyText);margin-bottom:8px;padding-bottom:8px}._2Ss7VGMX-UPKt9NhFRtgTz{margin-bottom:24px}._3vWu4F9B4X4Yc-Gm86-FMP{border-bottom:1px solid var(--newCommunityTheme-line);margin-bottom:8px;padding-bottom:2px}._3vWu4F9B4X4Yc-Gm86-FMP:last-of-type{border-bottom-width:0}._2qAEe8HGjtHsuKsHqNCa9u{font-size:14px;font-weight:500;line-height:18px;color:var(--newCommunityTheme-bodyText);padding-bottom:8px;padding-top:8px}.c5RWd-O3CYE-XSLdTyjtI{padding:8px 0}._3whORKuQps-WQpSceAyHuF{font-size:12px;font-weight:400;line-height:16px;color:var(--newCommunityTheme-actionIcon);margin-bottom:8px}._1Qk-ka6_CJz1fU3OUfeznu{margin-bottom:8px}._3ds8Wk2l32hr3hLddQshhG{font-weight:500}._1h0r6vtgOzgWtu-GNBO6Yb,._3ds8Wk2l32hr3hLddQshhG{font-size:12px;line-height:16px;color:var(--newCommunityTheme-actionIcon)}._1h0r6vtgOzgWtu-GNBO6Yb{font-weight:400}.horIoLCod23xkzt7MmTpC{font-size:12px;font-weight:400;line-height:16px;color:#ea0027}._33Iw1wpNZ-uhC05tWsB9xi{margin-top:24px}._2M7LQbQxH40ingJ9h9RslL{font-size:12px;font-weight:400;line-height:16px;color:var(--newCommunityTheme-actionIcon);margin-bottom:8px} Makeup gain is only really necessary for upward expansion. Once you do that and follow the steps provided here, bass compression is as easy as one, two, three. The attack time, as the name says, has to do with the time required for the compression to reach its value. Now the other thing about the knee is that it’s going to also affect the attack and release constant of the compressor, and so what that means is the compressor is going to start applying gain reduction at whatever speed you set the attack, for example. In normal compression, the knee (which is the point where compression begins) is an abrupt angle whereas in the soft knee it is more of a curve. As louder parts become louder, the signal will be louder after the expander than before, which can eventually lead to distortion of your gain-staging is off. Dynamic range compression attenuates the volume of loud sounds that cross a given threshold. A knee that is 6 dB wide won’t fully compress the signal until it hits 3 or sometimes 6 dB above the threshold (knee shapes may be different from compressor to compressor). If #2 from each are correct, that means that the knee starts working BEFORE the signal gets to the threshold right? It really depends on the unit, which is why 10msec on one unit can sound so slow compared to 10msec on another. Some compressors have something known as a knee control; it allows you to set a dB range around the threshold in which the ratio you've set is gradually applied. Most audio compressors operate using either VCA (Voltage Controlled Amplitude), FET (Field-effect Transistor), OPTO (Optical), or VARI-MU (Variable-MU). More so a case by case scenario. In my own mixing workflow, I prefer compressors that offer continuous, variable control over attack, release, ratio, and knee. New comments cannot be posted and votes cannot be cast, More posts from the audioengineering community. C'est un effet audio qui réduit le niveau des parties du signal qui dépassent durablement un seuil déterminé par l'utilisateur. thus, the attack time is dependent on the frequency you are compressing. The attack property's default value is 0.003 and it can be set between 0 and 1. As I rotate it clockwise, it opens it up more and lets more of the picking attack come through before the compression kicks in. The 1176 Peak Limiter is a dynamic range compressor designed by Bill Putnam and introduced by UREI in 1967. At -9.9dB (or -10...whatever) full ratio starts, for example. It kind of makes me think that the knee is basically something that extends the attack time somewhat. /*# sourceMappingURL=https://www.redditstatic.com/desktop2x/chunkCSS/ReredditLink.f7b66a91705891e84a09.css.map*/so attack is the speed of response, which can be tailored to the material to lessen or allow leading transients vs. the following sustain of the sound. Quick question: Is there any difference between the knee setting of a compressor and the attack time? this is the time it takes, usually expressed in milliseconds or dB / us or ms , for the gain reduction specified by the ratio, to occur. "Programme Dependent Compression" seems to be what your alluding to unless we are talking basic Hard Knee/Soft Knee DBX type compression. if you have signals peaking near and under threshold, they'll be compressed differentially, to kind of 'hide' the threshold setting. Attack & Release. So, the knee has to do with the level at which the compression occurs. ._12xlue8dQ1odPw1J81FIGQ{display:inline-block;vertical-align:middle} Now elsewhere on this blog we’ve covered compressor controls (attack, release, threshold, ratio, knee, etc. The knee is a way of smoothing out the way the compressor behaves when the signal is near the threshold so compression will start to react slightly before the threshold level and roll off after it's exceeded. That’s the technically correct definition, at least. ._3bX7W3J0lU78fp7cayvNxx{max-width:208px;text-align:center} Soft knee compression. ._3Qx5bBCG_O8wVZee9J-KyJ{border-top:1px solid var(--newRedditTheme-line);margin-top:16px;padding-top:16px}._3Qx5bBCG_O8wVZee9J-KyJ ._2NbKFI9n3wPM76pgfAPEsN{margin:0;padding:0}._3Qx5bBCG_O8wVZee9J-KyJ ._2NbKFI9n3wPM76pgfAPEsN ._2btz68cXFBI3RWcfSNwbmJ{font-family:Noto Sans,Arial,sans-serif;font-size:14px;font-weight:400;line-height:21px;display:-ms-flexbox;display:flex;-ms-flex-pack:justify;justify-content:space-between;margin:8px 0}._3Qx5bBCG_O8wVZee9J-KyJ ._2NbKFI9n3wPM76pgfAPEsN ._2btz68cXFBI3RWcfSNwbmJ.QgBK4ECuqpeR2umRjYcP2{opacity:.4}._3Qx5bBCG_O8wVZee9J-KyJ ._2NbKFI9n3wPM76pgfAPEsN ._2btz68cXFBI3RWcfSNwbmJ label{font-size:12px;font-weight:500;line-height:16px;display:-ms-flexbox;display:flex;-ms-flex-align:center;align-items:center}._3Qx5bBCG_O8wVZee9J-KyJ ._2NbKFI9n3wPM76pgfAPEsN ._2btz68cXFBI3RWcfSNwbmJ label svg{fill:currentColor;height:20px;margin-right:4px;width:20px}._3Qx5bBCG_O8wVZee9J-KyJ ._4OtOUaGIjjp2cNJMUxme_{-ms-flex-align:center;align-items:center;display:-ms-flexbox;display:flex;-ms-flex-pack:justify;justify-content:space-between;padding:0;width:100%}._3Qx5bBCG_O8wVZee9J-KyJ ._4OtOUaGIjjp2cNJMUxme_ svg{display:inline-block;height:12px;width:12px}.isInButtons2020 ._4OtOUaGIjjp2cNJMUxme_{padding:0 12px}.isInButtons2020 ._1ra1vBLrjtHjhYDZ_gOy8F{font-family:Noto Sans,Arial,sans-serif;font-size:12px;font-weight:700;letter-spacing:unset;line-height:16px;text-transform:unset}._1ra1vBLrjtHjhYDZ_gOy8F{--textColor:var(--newCommunityTheme-widgetColors-sidebarWidgetTextColor);--textColorHover:var(--newCommunityTheme-widgetColors-sidebarWidgetTextColorShaded80);font-size:10px;font-weight:700;letter-spacing:.5px;line-height:12px;text-transform:uppercase;color:var(--textColor);fill:var(--textColor);opacity:1}._1ra1vBLrjtHjhYDZ_gOy8F._2UlgIO1LIFVpT30ItAtPfb{--textColor:var(--newRedditTheme-widgetColors-sidebarWidgetTextColor);--textColorHover:var(--newRedditTheme-widgetColors-sidebarWidgetTextColorShaded80)}._1ra1vBLrjtHjhYDZ_gOy8F:active,._1ra1vBLrjtHjhYDZ_gOy8F:hover{color:var(--textColorHover);fill:var(--textColorHover)}._1ra1vBLrjtHjhYDZ_gOy8F:disabled,._1ra1vBLrjtHjhYDZ_gOy8F[data-disabled],._1ra1vBLrjtHjhYDZ_gOy8F[disabled]{opacity:.5;cursor:not-allowed} Goes above ~ -25 dB, the attack and release times if # 2 activity starting right at attack... 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