Ron, How would it look with a square or saw wave input? Thats what the oscillators that come with it make.
Square wave in.....square wave out.....works "OK"
Saw in....Saw out. "OK"
It is based off the idea that all "audio" starts out at 0 volts and some other
positive level. Never a negative level.
example: the output of a 555 is 0 and 5V. If you change the volume it is now 0 and 3V or 0 and 2.39V.
example: A saw wave form from 0 to 3V. and with with a volume control it changes to 0 to 1.5V.
There is this common theme of "o volts". No negative.
Audio from a CD player is positive and negative. A volume control changes the amount of + and - the same amount.
I think it works with these noise makers just fine. As long as audio is defined as a signal that all wise returns to ground and never goes negative.
I don't think it should be advertised to work with normal audio.
My guess is that it does not work the way the inventor think it does. This splitting up the AC and DC then added them back together is not doing anything good, and can be achieved more simply.
With the audio you are getting there are many harmonics. So if the amplifier is clipping, who will know?