Adjust the top wave by Clicking and dragging in the top area. The Bottom one will smooth by checking the average of sections of the top one. The smoothing slider changes the range of the checking for each segment. Click the play button to hear the smoothing (sometimes slightly glitchy, normally on the first one). This was really fun to make and I'm hoping to make more like it.
Got the Idea from a puzzle game called ABI-DOS from the segment of the name 'Signal Normalizer'