Audio Extractor/De-Embedder - HDMI has Digital Audio encoded within the signal, so what do you do if you need to connect a device that doesn't support HDMI? You need to split out the audio into either Digital (Coax or Toslink) Audio or Analog (Stereo Left/Right)
Audio Delay - "Lip Sync" errors require adjustable Delay so that what you see fits with what you hear.
Audio Inserter - Replace the Audio in your HDMI signal with a different Audio Source
Audio Leveler - Free yourself from those horrible loud commercials, keep from waking the whole house when loud events suddenly happen in a movie.