Comment 8 for bug 581786

SRU:
1. Bug is fixed in current development release (maverick) and bug report is listed as "fix released".
2.1. Currently the mute button in Ardour does not function and requires hand modification of an ardour system configuration file and deletion of a generated configuration file in the user's home directory to activate the mutton button pervasively.
2.2. In the current development branch and new upstream release resolved this bug.
2.3. A patch is attached to this bug report.
2.4. Test case follows....
TEST CASE:
  a. start jack with appropriate settings for stable, low latency performance
  b. start ardour
  c. create new track, arm new track, and record audio on new track
  d. begin playback of new audio track
  e. left click mute button...audio will *NOT* be muted
2.5. I am unaware of any potential regression, however if should be noted that if a regression did occur it would affect those using Ardour (i.e. excludes practically all desktop users and only the subset of ubuntu studio users who use ardour)

It should be noted that this is a significant regression (the loss of mute functionality in a DAW) in an LTS version.