While fully functioning, the input config was a bit difficult to get used to. I met my maker on Thursday :(. Good and challenging entry!
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After a bit of thought, maybe simply having the furthest most container show the color of whatever keys you have pressed. So if say blue(j), red(k), and yellow(l) are pressed individually, thats what color would show up in the mix cauldron. If you held down j and k for insance, it would show purple. So all you would need to do is fire as soon as you got visual feedback that you are holding your selected choice of color correctly on your keyboard.