clipping volume so Tom doesn't get an ASBO

git-svn-id: https://supercollider.svn.sourceforge.net/svnroot/supercollider/trunk@7123 a380766d-ff14-0410-b294-a243070f3f08

build/SCClassLibrary/Common/GUI/PlusGUI/Control/ServerPlusGUI.sc

@@ -248,7 +248,7 @@
 				.align_(\center)
 				.action_({arg me;
 					var newdb;
-					newdb = me.value;
+					newdb = me.value.clip(-90, 6);
 					this.volume_(newdb);
 					volumeSlider.value_(volSpec.unmap(newdb));
 					});