did you try my plughw variation that I had to do?I tried your mod and for some odd reason it worked perfectly well for browser flash audio but I couldn't get DeadBeeF or Smplayer to produce sound. The alsa output plugin just wouldn't work - which is bizarre! Probably down to something I didn't do or change following creation of root/.asoundrc
I never got a slider either...one of those linux myths ..indeed no sound at all testing that approach.
mike