It’s Computer Music's 20th anniversary this month… and to celebrate, readers of CM260 get a totally exclusive mastering-grade processor from one of the most revered brands in the world of analogue modelling!Based on some seriously smooth mastering hardware, Acustica Audio’s Violet CM is a three-band valve compressor suitable for mixing and mastering duties. Use it to transparently even out dynamics, or dial up the heat to imbue your mixes and masters with expensive analogue colour and flavour.Find out how to use Violet CM in the video below, and buy CM260 to download the plugin in VST, AU and AAX formats for PC and Mac.Acustica Audio offers a single band version of Violet for users of their Nebula 4 software. This version made exclusively for Computer Music Magazine is a three band version of the compressor.