The lighting FX box will make the lights flicker or flash but not in sync to music like I think you are asking about. This system operates solely by the sound level of the input and it has a volume control to adjust the sensitivity to the sound level.
What are you trying to do with this device? a singing pumpkin routine by any chance? if so, cheapest and easiest way to come close to this effect would be with a Gemmy Light Show with an mp3 plug in. An LOR system would be a more sophisticated and more expensive alternative with the best syncing. You'll find a number of threads on the forum about both. Depends on your budget and abilities to program the system (particularly the LOR; Gemmy LS, just plug and play--results will depend on the songs used--it's pretty much a stand alone system with no need to connect to a computer unlike the LOR).
Sometimes you can find the Gemmy system at very good prices. Xmas stuff is always cheaper than halloween versions; greater volume, lower prices. If you will use an mp3 player, then the preloaded songs won't matter much and I'd look for the best price you can find. Be aware if you see a great deal in price that there are versions of the xmas green LS that did not have an mp3 player attachment and you wouldn't be able to use it for your halloween usage.