I'm not sure where I read this (might want to check with RJ) but I think you will need to send all 4096 channel's of pixelnet. I think it has to do with how RJ's SSC works. A solution might be you send 512 of data from the SD card and the rest zeros.
That might be a good idea, I'll also have to let you set the start address and pad zeros on both ends.
