It just divides the position where the host is started by 4 beats. E.g. if the start position was 3.3.1.0 where the 2nd bar is 3/4, the position is 4 + 3 + 2 = 9 beats from the top, 9 / 4 = 2 bars and 1 beat, then the plugin starts to sync from 1/4 on the gui, i.e. 2nd beat.
It’s far from ideal as you have to copy these patterns forever, but you can work around like this;
By enabling the “MIDI” switch and setting it to 1 Cycle, a MIDI note starts the FXModulator’s cycle. Place these notes on every bar including the 3/4 and following then you can get the desired result.