I'm not sure not I'm hearing much difference between OS 1.1.4.4 and OS 1.1.4.9 as far as pulse width calibration is concerned on my 16 voice. I still have the most consistent calibration on voices 9-16, and the most variable with 1-4 and 5-8. There probably is no other way to knock this pulse width calibration into shape without digital trim pots, calibrating each oscillator by ear. My oscillator 2 calibrations are pretty darn good from 0 to 75% pulse width. Oscillator 1 is still pretty off across all pulse widths, that's where the calibration by ear would be cool.