Thanks Ivan, Merlijn,
The reason for wanting to invert the polarity, is to compare previously stored traces directly on top of each other.
Whenever I've made sub measurements where all i was doing was measuring the sub, I've never cared about polarity...I mean, 0 or 180 ...what's the diff in seeing what phase looks like..
But now, trying to compare past captures, I wish I'd bothered to stay consistent.
For instance, I'm trying to inspect a bass reflex phase trace taken pol+, to a FLH taken pol-.
When I click a phase trace and use the up/dn arrows, the entire graph moves with no change in the trace positions relative to Y-axis scale (or each other).
So I'm still left wondering how to either bump a trace up or down, or invert one....