While searching for interesting HCI and Dynamic Media Institutions I stumbled upon this excellent archive of the Interfaces Montreal conference. There is an interesting blend of commercial, academic and artist presentations archived in video here. The sections of Visualization and Audio looked to be of particular interest. Unfortunately for me the speakers are mostly French Canadian and I am for all intents and purposes mono-lingual (at the best of times).
http://www.interfacesmontreal.org/english/index.php?option=com_content&task=view&id=70&Itemid=193#self
There are abstracts in English.