🎮 NES 2A03 2-Octave APU Track: Pulse 1 (Square Wave) Triangle (Fixed Bass) Duty Cycle (Pulse Only): 12.5% (Nasal) 25.0% (Classic Lead) 50.0% (Hollow Square) C4 A4 C5 A5 C6 Click keys to play (C4 - C6)