I'm attempting to follow the manual's instructions for calibration but one issue I'm having is being able to set the VU meter's to "0" with a .3v input (and output) signal. I've checked the voltage of my incoming test tone and ensured it's at 0.3v. I then connected the oscope to the output of the tascam and fed it the tascam the 0.3v test tone. Then I set the input trim until it read 0.3v peak to peak on my oscope. However, with this input trim, the meter trim pot (R141) does not have enough range to bring the needle past about -3. (I currently set the meters to read -10) Am I missing something? EDIT: I did some additional adjustments plugging the unit into one of the two mixers it will be plugged into while taking measurements. One is directly to my RME M32 AD pro converters and the other is my Midas Venice F32 both of which have a 10km impedance (instead of the 50k mentioned in the manual). With the RME plugged in, I was able to increase the input trim more and get a little bit closer to zero. Not sure how to address this issue. Should I adjust the input trim to a different value to make up for the impedance difference?