I am currently setting up some Halloween decorations and thought it would be cool to have some audio play when changing scenes. It can be short MP3s or WAVs. The problem is I am not going to go pay $800 for Sonos speakers when I am going to use this once a year. Will a regular bluetooth dongle plugged into a USB port be pairable in anyway in HS3-pi and allow to trigger simple sounds on an outdoor speaker nearby? Or will even a USB sound card with a line out work? Thanks.