You can't multi texture a matrix. You need to use plains. But for the effect you're looking for using matrices, you do all the blending in a graphics package, and have each type of blend in s separate section of the main image and use the standard matrix texture commands to texture the matrix.
An image like this...
Or you could use the image kit plugin to create the blends at runtime, then texture the matrix with those.
But you can't take 3 images, and texture one matrix with them.
1 matrix, 1 texture.
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