Test with #tag magic word ({{#tag:phonos| test|file=Colonel Bogey.ogg}}). Test with direct tag syntax (<phonos file="Colonel Bogey.ogg"> test</phonos>). (There are blank lines between these three sentences – shouldn’t each become a paragraph? But that might be unrelated.)
Produces (permalink):
Or, in articles (diff):
Is this expected (and templates like {{audio}} should trim the wikitext before they pass it into Phonos), or should Phonos behave differently?