I have found a very good EQ, which can be used to produce the Smiley Curve in great detail.
It's a free 10 bands parametric EQ, called IIEQ.
There is a nicer version the IIEQPro. This one works as demo 100%, but if you want to store patches, you have to buy it. It only cost $15.--, what is good value for money.
There is also a stereo version, which can be used in series or parallel.
So you can EQ each channel seperate or create a 20 bands EQ. Great!
Here you can download them: http://www.ddmf.eu/