Hi! No, it's not about SPL calibration, I'm interested in the sound card calibration signal level. The first two photos show the calibration signal of the sound card installed only by the monitor pen, in the next two photos the calibration signal is set only by the amplification knob of the microphone input channel. The signal level is completely different. Adjustment to reference -12 dB in the first and second cases gives different calibration results. I wonder which pen to unscrew to the maximum when calibrating the sound card, and which pen to adjust the level to the support one. Thank you!!!