"The low notes are inaudible." Fix: Vocaloid 6 AI has a "thinning" issue in lower registers. Go to the EQ section (Renderer settings). Boost +3dB at 150Hz. Then, increase Power to 70% and Tension to 20% to add chest resonance.
window. Instead of manual drawing, you can adjust the "expressiveness" of the AI. vocaloid 6 tuning