12 V source · 2 kHz · L 2.2 mH · Cᵢ 2200 µF · Cₒ 220 µF · load 24 Ω. Steady-state, continuous conduction. Textbook reference neglects ripple and power-stage losses; it uses the mean input voltage after the selected feed resistance. Optional losses: Q 80 mΩ, L 120 mΩ, diode 0.55 V, Cₒ ESR 40 mΩ. Pressure: 100 Pa/V. Particle speed ∝ current / channel width (constant depth); one playback scale everywhere. Capacitor walls are preloaded at their mean charge; their motion shows charge ripple. Wheel angle follows integrated current. Geometry is schematic; no added pipe compressibility or device switching parasitics.