diff -rup lcdproc-0.0.10.sav/lcd.c lcdproc-0.0.10/lcd.c
--- lcdproc-0.0.10.sav/lcd.c	Wed Aug 30 21:11:17 2006
+++ lcdproc-0.0.10/lcd.c	Sun Sep 17 12:48:23 2006
@@ -258,11 +258,14 @@ void cLcd::SetWarning( const char *strin
   }
 }
 
-void cLcd::ShowVolume(unsigned int vol, bool muted ) {
+void cLcd::ShowVolume(unsigned int vol, bool absolute ) {
 if (!connected) return;
   BeginMutualExclusion();
-    ThreadStateData.volume=vol;
-    ThreadStateData.muted=muted;
+    if (absolute)
+        ThreadStateData.volume=vol;
+      else
+        ThreadStateData.volume+=vol;
+    ThreadStateData.muted=(ThreadStateData.volume==0);
     ThreadStateData.showvolume=true;
   EndMutualExclusion();
   if (ThreadStateData.muted) {