Oh yes i see them there..they were all set to offMy things down under are all good !!
I can't remember where the setting is on the GT-10B, in the System menu somewhere,
but if you use GT-10BFxFloorBoard editor, in the System tab "input and patch settings",
set "PREAMP MODE" from 'patch' to 'system 1'
then check the "system preamp 1" page to see if the preamp is switched 'off'.