正式なコメント
Those are the R G B colours, plus their variants (R+G=Y, R+B=M, G+B=C, R+G+B=W). The idea here is to quickly and easily access these standard colours, not for it to be a custom override.
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Please create ability to put here custom colors! 
Those are the R G B colours, plus their variants (R+G=Y, R+B=M, G+B=C, R+G+B=W). The idea here is to quickly and easily access these standard colours, not for it to be a custom override.
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I understand the point, but I would like to have possibility to map my PC keyboard for more colors. Or for example I'm not using sampler on my midi controller, so I would like to use its buttons for lightning effects, f.e. change lights colors to UV, orange and etc.