John, hi. You had to make two corrections in a couple of days. But that's not all. When in the preferences window I change the sampling rate and then start the calibration of the sound card, the calibration is performed with the set frequency. But when I go to the measurement window, there is always a final measurement frequency of 22050 Hz. I switch the sampling rate to any in the measurement window, but the final frequency remains 22050 Hz. If you go to the preferences window and switch to any frequency, and then to the measurement window, the final frequency remains 22050 Hz. Although, when you hover the mouse over the end frequency in the context menu, the changed frequency. If you start a measurement, it ends at 22050 Hz. When you press the generator button, the final frequency is 22050 Hz. One video file is too large. Therefore, there are 4 of them.