Interesting. Here's what it says on the Test LP:
Azimuth Adjustment
Track 2: 1kHz reference level Left channel only
Measure Right channel output.
Track 3: 1kHz reference level Right channel only
Measure Left channel output.
The object is to sit the stylus exactly perpendicular in the groove.
Twist cartridge about its radial axis until the measurements from Track 2 and Track 3 are equal or very close to equal for both channels. (Or at link: Analogue Productions)
I read this as saying that unequal cross-talk is a possible indicator of non-perpendicular azimuth. I think everyone is saying just about the same thing, regardless of terminology. Of course there are other influences on cross-talk at the speakers as well, not at all attributable to the TT. So you just have take each measurement as an indicator, not the absolute truth. That's a good thing about the Fozgometer I guess - it takes out all other parts of the system downstream of the TT.
These setting are definitely fussy on the VPI tonearm, but doable with some patience.
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