FX Sync and Random operation The FX system uses a dedicated internal synchronization clock. If two different FX that repeat in cycles are activated, the FX Sync DMX channel 19 can be used to synchronize them. When two FX are synchronized, the repeat cycle of FX2 is adjusted to ensure that FX2 arrives at the end of a cycle and starts to repeat the cycle at the same time as FX1. If one FX with a short repeat cycle is combined with another FX with along repeat cycle, the short FX can repeat twice or more in the time it takes the long FX to repeat once. But if two FX with different repeat cycles are synchronized, the short cycle is adjusted so that it arrives at the end of a cycle at the same time as the long cycle.