Read the explanation
The source’s default fundamental is two hundred sixty one point six three hertz. Harmonic two is five hundred twenty three point two six, and harmonic three seven hundred eighty four point eight nine. Each drawbar sets that partial’s coefficient. The coefficients change the harmonic mixture, while the integer frequency rule defines the spectrum’s positions. The source labels the sum of squared partial amplitudes as watts. That is its numerical proxy, without a physical power calibration. For illustrative partial coefficients one and one half, the sum is one plus one quarter, or one point two five. Doubling both coefficients multiplies that proxy by four. The source’s actual drawbar bounds and optional gain remain separate from this algebraic illustration. The displayed spectral centroid weights harmonic frequencies by amplitudes, then divides by their sum. With only amplitudes one at the fundamental and one half at harmonic two, the centroid is four thirds of the fundamental: about three hundred forty eight point eight four hertz. This is amplitude weighting, not squared-power weighting. The sixteen-partial source preset and exported configuration preserve that chosen rule; optional browser audio is synthesized, not recorded sound.