The step sequencer has a clock input you can drive with any clock signal such as the LFO (which can also do audio frequencies, not just low frequencies).
The step sequencer can use its internal clock or the clock input, there is a toggle button on the p-page to switch this.
Multiple step sequencers internal clocks can be synced as well. There is a manual page for the step sequencer which @celine already posted in the forum.
When the delay/reverb are moved into modules instead of being global i will look into adding a clock input for those.