MIDIClock can be used to synchronize multiple sequencers/synths.
You can do this using MIDIYoke (get it at www.midiox.com) :
Connect MIDIClock to MIDIYoke Junction 1 output. As MIDIYoke is a multiclient
driver, you can connect multiple sequencers/synths (such as rebirth, AN1x,…)
to MIDIYoke Junction 1 MIDI input.

By editing the clockpresets.ini file, you can achieve even more
advanced remote control of midiclock. Enable HexSpy to monitor the
incoming midi messages. It will help you determine which entries
you need to add to the ini file.
The BPM_PRESETS section contains the tempo settings for all patch selects.
You can add action codes to any of these entries.
Additionally you [...]