 Next, let's open open a monitor for the last WAVOUT (U_9). Please note that 3kHz is delayed before the adder.  The 1kHz sine wave is overlapped by the 3kHz sine wave... But it looks
different from U_8 because of Phase Shift.  Let's listen to the sound by choosing "Tools" -> "Play
Wave" on the menu. You may find the sound is the same as U_8!! So when you have Phase Shift,
you can see the difference on the waveform but cannot hear the difference
on the sound. 
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