There is an official IRC channel #Hydrogenaudio on Freenode, there is a link in the wiki. But sadly, it is very empty, nobody chats in the chat room. I think it bit sad really. Of course nobody has always time and we don't all live in the time zone but I hoped that at least sometimes someone would come start a discussion if were just making fun about claims about thing a sounds better than thing b w/o evidendence.