You will not believe :
I got Roland Cakewalk UM-1G the manual on web, read it entirely, found driver for Windows 7, tested the cable all again, installed driver again, checked connections again (Cable Midi In for Piano Out and Cable Midi Out out to piano IN)... Didn't work... So I realised the cable's circuit box was scratched, the painted name was missing a large portion, and I imagined if it was opened before, maybe a technical fix or attempt... I imagine someone "fixed" it once and could had placed the interior wire cables, or soldered, reversed. What else could be the explanation??, I imagined. I believe it would not work but anyway I decided to put the MIDI plugs reversed, intead of the right connection of In>>OUT and OUT>>IN, I placed this time IN>>IN and OUT>>OUT.
And surprise, It worked !!!
MIDI IN LED also blinks now when I play.
I got the same latency number in pianoteq as before (playing with mouse), 10ms. See no difference, and the response while playing with digital piano. The cable circuit box switch Advanced Driver (sellect a advanced drive for better performance) instead of a standart one, makes no difference or no difference I can notice in terms of reduce any extra latency the cable have in relation to the software latency.
Well, it's used but I paid about 23% of what would be a new one. The seller had sent me the money back when I explained every details of instalation and why wasn't working. Now I will contact hin to pay hin again, but will wait the money he sent back get in the credit card account. Should I ask a discount due it only work reversed and the headach I had in these 2 days ?? Háa háaa... I will pay 6% less since now will be out from the selling website, which charges 6% tax for each sale.