The bias at character = +1, in the SHAPER's own input units — OMX_DRIVE_BIAS_MAX.
DERIVED, not chosen (§4b). In the saturating limit every knee tends to sgn, the output is a
rectangular wave of duty d = ½ + asin(b)/π, and its nth harmonic goes as sin(nπd)/n — so
|H2| is maximal at d = ¾, which is b = sin(π/4) = 1/√2 exactly. Measured too: the
H2-maximising bias for a full-scale sine at unity drive is 0.712 (soft), 0.658 (tape), 0.645
(tube), and this one value costs 0.000 / 0.035 / 0.088 dB of H2 against each curve's own
optimum. ONE normalised bias for all three knees, not three.
The bias at
character = +1, in the SHAPER's own input units —OMX_DRIVE_BIAS_MAX.DERIVED, not chosen (§4b). In the saturating limit every knee tends to
sgn, the output is a rectangular wave of dutyd = ½ + asin(b)/π, and itsnth harmonic goes assin(nπd)/n— so|H2|is maximal atd = ¾, which isb = sin(π/4) = 1/√2exactly. Measured too: the H2-maximising bias for a full-scale sine at unity drive is 0.712 (soft), 0.658 (tape), 0.645 (tube), and this one value costs 0.000 / 0.035 / 0.088 dB of H2 against each curve's own optimum. ONE normalised bias for all three knees, not three.