Technics SC-DV290 System "change tv aux without remote" Questions

...TV mode without switching between modes to change the volume, see below. Source http://www.hifi-remote.com/forums/viewtopic.php?t=8831Quote:Locking Volume Control To TV or AUX Mode: 1. Press and hold ...

change 1" message on the amp when I plug it all in. All pieces are DV 290 and all except the SH-DV290 are brand new. I bought the system without the SH module and tried using an SH-EH770 but it didn't