One thing I can say right now is, I can make graph links for anyone who would like me too.  I made one for myself and it works fine.  If you would like me to make one for you, I ask for $15 to buy materials, and make the link. I will also email you software to use with it, or you can download some off the net. As of this moment, I bought a new soldering iron, and have the materials for parts of two links. If you have any interest in this, email me, let me know, and I'll see what I can do.