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I think, from what Deerman is saying, that this is how that happens:
Birds that are split to Pied (just one Pied gene) and birds that are split to White (just one White gene) can vary in the amount of white feathers they have, but it will always be just a few. The problem is that the "just a few" amount can overlap between the two -- and some birds might have only a VERY few white feathers, so as to appear almost normal. Genetically, however, they are still "split to Pied" or "split to White." If a pair birds with VERY few white feathers JUST HAPPENS TO BE made up of one parent that's split to Pied and the other that's split to White (even though they may both look the same), then 25% of their offspring will be "Loud Pied" (one Pied gene, one White gene). The rest will be Normal (25%), or look like the parents (25% split to white, 25% split to Pied).
Here's the equation (again, using easier-to-understand abbreviations...let the "-" mean the "normal" version of the gene):
split to Pied X split to White = 25% Loud Pied, 25% split to Pied, 25% split to White, 25% Normal
P- X W- = 25% PW, 25% P-, 25% W-, 25% --
Deerman....does that make sense from your experience?