 Let's open a monitor for WAVOUT (U_22).  The signal has been shifted by four samples, which means 90 [degree].  It goes to MULTI2 (U_38) and multiplied by AM signal. Please open a monitor
for WAVOUT (U_9).  The multiplier's output is like following. RMZLPF (U_15) is located after
this to remove high frequencies. 
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