explained AllNotesOff function git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2930 a95241bf-73f2-0310-859d-f6bbb57e9c96
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2880 a95241bf-73f2-0310-859d-f6bbb57e9c96