The gray graph shows an FFT sonogram of the incoming signal.
You may set 8 "frequencies" manually to interesting spots of that spectrum or click proposal for random setting.
A sine wave at this frequency will then be envelope-followed by the incoming signal.
Use the number box on the top to scale the envelope follower logarithmically.
~boost: boosts the sins
~noise: adds a bit of noise
~steady: straightens out the sine waves, smoothens over beating frequencies.