Question to owners of Luxman C-600f/M-600a

Which cable should I use for remote control? I connected preamp and amp with a standard phone cable with RJ11 connectors but there was no effect... Or should I invert the pins on one of the connectors?

The second question is about "tone control" option. When I turn it on the sound dissapears except for a quiet sound from the left speaker. Is is normal or something is wrong with the preamp?