Normally, an attack time of 0 ms would create a click, which is why the attack time of compressors starts only at 0.1 ms. With this workaround, you can achieve 0 ms and thus very tight sidechain compression. This Ableton Live Insider Tip was sent to me by Mads Christensen aka MessyMass.
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If you have any questions or suggestions, drop me a comment below.