ear:I have the home cinema audio out connected to to Md-in (on the sony amp) and Md-out (on the sony amp) connected to cd-in on the yamaha amp.Sound comes out from the sony amp when MD selected,No sound coming from the yamaha amp though.
Like JD, I'm a bit baffled as to what you're trying to achieve, but not surprised you're not getting sound from the Yamaha amp when connected like this, because
a) When you select CD-in on the Yamaha, there's no signal going out from the 'home cinema audio out', as this will only deliver whichever source is selected
and b) The tape out on the Sony amp probably can't get a feed from the amp's tape in, as then there would be a feedback loop.