"I've recently purchased the Sony HT-Ct 350 soundbar. What settings do other owners find are best to create "virtual surround sound" I currently have played around with the bass and treble and have the centre speaker at +3. Someone has suggested I keep the TV internal speakers on as well. Any preferences?"
You might want to read the other blog titled HT-CT350 and Ct-150. There are more than 1100 posts on various topis related to the CT-350 and some include settings people have found to suit their taste or viewing environment. Of course you know that what works in one person's setting might NOT be the best for you as walls, floor coverings, ceiling height, etc.. all play an integral part in how sound gets delivered to your ear and so the only "real" way to find sound YOU like, is to fiddle with the settings on your SW in "your" viewing environment..