[1000mp] sub band rx audio selector switch

[Martin]

Hello to all
                 yesterday i plug a rigblaster plus via the audio output 
and mike front plug in my FT1000 MP mark V.
IT receive and transmit very well BUT via the sub receiver.  I want to 
use the main VFO.
I found in the instruction that it suppose to have a switch on the AF 
unit board to select the main or the sub VFO for this kind of 
transmission ????
Anyone made this ?
Tnx and Merry Xmass to all of you.
Martin
VA2ZO