"There are times when it makes sense to mute and unmute instruments for just a portion of a song. For example, if you are performing a musical with four reed books, but you only have two reed players, you would probably show-mute Reeds 1 and 2 in Sinfonia and give these parts to your available players. However, there might be a 16 bar section of one song where there is a particularly interesting phrase written for Reeds 3 & 4, while Reeds 1 & 2 are tacit. You might then want to move your available players to the Reed 3 & 4 books just for that section. The easiest way to accomplish this is through the Section Mute window. Section muting is convenient because it allows you to specify a duration that your muting or unmuting will last; in so doing, it automatically performs the step of re-muting or re-unmuting the instrument at the end of the duration. Section Mute also allows you to perform similar mutes or unmutes on a group of instruments. So to take the example above, you can mute Reeds 3 & 4 together from measures 10 to 27 in one fell swoop."