Round 12 — BOYIFY experiment (your question: can the professional girls be made boys?). Praat gender-shift: formants and pitch scaled down together — soft/mid/hard vs unshifted. Listen for: does any setting sound like a BOY rather than a slowed girl, and does the shift introduce artifacts (metallic/chipmunk-inverse)? If a setting works, shifted copies of the professional girls become DERIVED TRAINING SPEAKERS (legal: あみたろ allows processing+training; れぷりかどーる is CC BY) — professional recording quality in a boy register, which is the thing the corpus world doesn't sell.