Ah so, the Minolta Wireless Flash Controller, that’s one I never had anything to do with, I get the impression after doing a bit of research http://thesybersite.com/minolta/flashfacts/
that that one was for analog wireless flash fancy stuff like group ratio control for compliant film cameras and flashes (some of which didn’t have an onboard flash).
I think the major problem (reading between the lines) with it is the digital cameras don’t have the real time OTF metering system that it was designed to communicate with, I don’t know why it couldn’t still send a sync pulse though unless they changed how that is transmitted as well, maybe different voltage and response timings http://www.mhohner.de/sony-minolta/flashcomp_diagrams.php
so the unit doesn’t recognize the camera it’s mounted on, it also apparently will only work with the 5400xi, 5400HS and 5600HS(D) flashes. http://www.mhohner.de/sony-minolta/flashcomp_multi.php
In any case even if it did work it would most likely want to communicate control signals with compliant flashes ‘DURING’ the exposure, maybe the hand book for it would through some light on it (so to speak) but I can’t find one so far.