lewm
"VTA adjustment on the fly" is perhaps the most over-stated feature of any tonearm.Perhaps. One of the problems with on the fly VTA is that when you change VTA, you're changing a bunch of things. Of course you also change SRA, but you're also changing VTF, overhang and tangency and potentially altering azimuth, too. So the notion that changing VTA on the fly let's you "dial in the sound" isn't quite accurate.
Who here has ever tried to adjust VTA while playing an LP, which is presumably the meaning of the term? Unless you don't care about the LP or the cantilever, this simply cannot and probably should not be done, without trauma to either component.This is mistaken. Of course it's difficult to do on a lightweight turntable or one with a very compliant suspension. But something like an SME V on a heavy plinth turntable such as a VPI TNT does allow for the safe adjustment of VTA while a record is playing.