From my blue ray player I only use a HDMI cable, no audio cables needed casue it all goes threw HDMI. Maybe the is causing you echo effect trying to use both? But of course if you TV does not pass threw the sound to the amp...
I'll have to post a picture sometime of all the remotes I have on my end table to run all my stuff. Universals only do so much function wise so you need the original remote. Looks like a parking lot.