Mort, It depends on your set up. If you use DMX firmware on the DMX dongle you will get 512 DMX channels out. If you use Pixelnet firmware on the DMX dongle and insert an Active SS Hub to your set up, you will get 4096 Pixelnet channels out which you could use on your SSC's (You said you have 2-4 SSC's so you would only need approximately 520 channels). At the same time you could get 512 DMX channels off of the same Active Hub by using DMX out on the Hub. Moderators, please feel free to move this, as I do not want this thread to go off track. Hope this helps, George