The Official Sequential/Oberheim Forum
SEQUENTIAL/DSI => Prophet => Prophet Rev2 => Topic started by: Indigo V. on August 04, 2018, 05:39:07 PM
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I updated from Main OS 1.1.0.3 to v1.1.4.9 and noticed that the 50% PW setting on voices 1-4 compared with 5-8 improved, ie. they sound very similar. However the difference between voices 9-12 compared with 13-6 is worse than before :( I did reboot, factory reset and recalibrate. (However, calibrating doesn't effect PW anyway, right ?)
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I updated from Main OS 1.1.0.3 to v1.1.4.9 and noticed that the 50% PW setting on voices 1-4 compared with 5-8 improved, ie. they sound very similar. However the difference between voices 9-12 compared with 13-6 is worse than before :( I did reboot, factory reset and recalibrate. (However, calibrating doesn't effect PW anyway, right ?)
It does influence the Pulse Width since it is controlled by an analog control voltage (converted from digital values by a DAC).
So calibration IS needed to account for small tolerance variations from electronic components.
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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.