Which Pangolin FB3's are you considering buying?
The "standalone" FB3-QS that normally comes in the QuickShow package does not have a memory card slot.
The FB3-SE did, but those were really OEM controllers that were designed to be permanently installed in the projector.
There was (maybe still is) a "LiveQuick" program for the SE from Pangolin that was designed to let you do just what you want -
Load a bunch of cues to the card, then trigger via DMX. It works, but it's pretty limited, compared to actually controlling directly via QuickShow.
Pretty sure the SE version is a special order item now; ordering a new copy of QuickShow is going to get you the FB3-QS.
FWIW, from what I've seen, the built-in DMX-triggered cues available on some imported projectors are VERY limited, and often with unpredictable image size and orientation. Personally, I definitely would NOT recommend depending on built-in cues, especially when an audience is involved!!
Probably the majority of folks on this forum would suggest you don't go "cheap" on the controllers, given that you are dealing with potentially harmful lasers powers with an audience involved! You want to make sure you have ABSOLUTE control of your lasers at all times, and you won't necessarily get that with some of the cheap laser controllers that are available. Go with a well-established manufacturer that can provide sales & technical support ~ Pangolin isn't necessarily the only game in town, but they ARE well-established and well-respected, and provide very reliable software and hardware.
Not to mention there are TONS of free shows for the Pangolin software available on the Pangolin Shows portal, plus the QuickShow / FB3-QS package has an upgrade path to Pangolin's professional level BEYOND software, should you decide you want to move up at a later date.
For your setup, you really need to be using at least two active controllers -
One for the graphics, and one for the beams (provided you have a projector with ILDA "thru" connections, or an active ILDA splitter box, you could run both beam projectors off the same ILDA feed from one of your controllers).
One laptop running QuickShow can control multiple FB3's simultaneously; you'll just need to spend some time setting up the projection zones so you can specify which cues go to which controller. Most of the controls in QuickShow can be activated remotely by MIDI or DMX, so as long as you have an Enttec DMX USB Pro (the DMX interface officially supported by Pangolin) feeding DMX into the same computer, your QuickShow laser cues could still be triggered by DMX, while also simultaneously maintaining full control of your lasers from the laptop.
Good luck with your gear purchase and setup - keep us posted!! 
Randy
Last edited by Stuka; 10-20-2014 at 03:47.
RR
Metrologic HeNe 3.3mw Modulated laser, 2 Radio Shack motors, and a broken mirror.
1979.
Sweet.....