One question that we often get is how to use multiple output strips at once with the library. There's a variety of reasons why someone might want to have multiple strips coming off of their arduino ...
Run code for SmartMatrix, Adafruit-GFX-Library, FastLED (2D), and LEDMatrix on linux/Raspberry Pi with X11, SDL, or on top of RGBPanels - vortigont/ArduinoOnPc-FastLED-GFX-LEDMatrix ...