Well, yes, but this should be the same approach when you balance by software or say.. through FB4...isn't it? but into analog environment...because you loose driver bandwidth when balancing into digital as well.
Sometimes you can't tweak drivers current on commercial PJ (warranty, no 'simple' access etc), and most of them are not well balanced, you know..usually too much blue and weak Red.
So many times we need to reduce green/blue if a good RGB balance is required...mainly on high power units. So we 'play' with voltage modulation to achieve this, any other idea to do so?