provide a way to sync between visualization and sound

workaround for http://musicpd.org/mantis/view.php?id=2503

doc/config

@@ -35,6 +35,16 @@
 #visualizer_fifo_path = ""
 #
 ##
+## Note: Below parameter is needed for ncmpcpp
+## to determine which output provides data for
+## visualizer and thus allow syncing between
+## visualization and sound as currently there
+## are some problems with it.
+##
+#
+#visualizer_output_name = ""
+#
+##
 ## Note: To enable spectrum frequency visualization
 ## you need to compile ncmpcpp with fftw3 support.
 ##

doc/ncmpcpp.1

@@ -70,6 +70,9 @@ Set connection timeout to MPD to given value.
 Default number of seconds to crossfade, if enabled by ncmpcpp.
 .TP
 .B visualizer_fifo_path = PATH
+Name of output that provides data for visualizer. Needed to keep sound and visualization in sync.
+.TP
+.B visualizer_output_name = NAME
 Path to mpd fifo output. This is needed to make music visualizer work (note that output sound format of this fifo has to be 44100:16:1)
 .TP
 .B visualizer_type = spectrum/wave