Big El,
I think you can ditch the RGB To Color block, if that's what you're using.
If I understand your description, what you need to do is use Interleave 1D Arrays to combine your three sine arrays together into one long array. Then use Draw Flattened Pixmap to turn the array into a picture. You can use Bundle By Name to stick your interleaved array into the image data cluster, and also make sure to specify 24-bit image depth and an appropriate bounding box.
Hope that makes sense,
John