minor copy edit

readme.md

@@ -11,7 +11,7 @@ difference and future tones are generated live by supercollider oscillators.
 
 the **difference tones** range from 20 to 160 herz. we call them difference tones because their frequencies are defined by differences between some of the frequencies played by clara and bec. 
 
-the **future tones** range from 800 to 6000 herz. at the times when they are played, they anticipate tones that clara and bec will play in the future, meaning later in the piece.
+the **future tones** range from 800 to 6000 herz. at the times when they are played, they anticipate tones that clara and bec will play later in the piece.
 
 ### samples
 noise flute and breath noise are samples provided by clara and bec.