I was looking for somekind of framework or script in order to use trackpad as multitouch device. At first I found TongSeng from TUIO. After a little googling, I came across with an external called Fingerpinger which was written for Max Msp Jitter. It’s free and opensource. You can download it from here. And it’s very easy to work with it.
Squatouch is a computer-based musical interface and offers a multitouch user interface via the forms of direct interaction which is designed and programmed by me.
Some shots from my multiouch screen. Further information from: Squatouch
How it is made?
Logo work and musical interface of Squatouch. Musical interface is developped with Max5.
In these ones, I’ve tried totally different values. I think, there some bugs about CCV tracker software. Because, in the morning multitouch screen doesn’t work as I expected. However, a few minutes ago (23:13 
)I’ve got these results with the same compliant surface. I’m not sure about it. May be , the problem is my Toshiba laptop. Anyway, it’s working now.
Glitchograph is an image processing interface. It shoots user’s photograph via webcam that attached on the frame. There are two push buttons on the frame. One is for to capture image and apply it glitch filter. Other one is for refreshing screen to enable capture new images.
I used 10 kohm resistors with switches. You can download from here
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