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Correct I have very little control in Vista, but more so because I think it's a Analog Mixer box more than a sound card.

Every time I try to calibrate to 75, when I go to measure it says it's way too low a volume. and I assume if I boost Line-Out, Line-In on TASCAM or Output on Stereo to solve it then I'm no longer SPL calibrated and need to do it over (with value above 75). I can raise Output level in REW (or Vista which I have almost Maxed) but the REW starts to complain I'm out of normal range (I think, I need to retrace my steps again with this feedback). If I recall REW has recomended output range (not to exceed -6db). Sorry if I'm mixing things up, it was a late night.