The Boss Digital Recording Studio (Version 2) can be synchronized by MTC commands.
This feature is still under development, as a result, the BR-1600CD is currently not yet supported by midiclock.

The Yamaha Motif XS can be synced to midiclock.
Here’s a quick guide how to set this up :
On the screen shown below, edit parameter (5) :Midi Sync.

You can set this to Auto or MIDI to synchronize with midiclock :
Setting MIDI : the XS will always sync to the external midi clock
Setting Auto : the XS [...]

The Yamaha Motif ES can be synced to midi clock.

Use the following menu :
[F5] MIDI –>[SF3] SYNC–>MIDI Sync :
Set to ‘internal’ for synchronization to internal clock. Use this setting when this synthesizer is to be used alone or as the master
clock source for other equipment.
Set to ‘MIDI’ for synchronization to a MIDI clock received [...]

The yamaha MM6 and MM6 can be connected to a pc through USB.
This allows the same MIDI workflow as usual on you computer.

By setting the external clock to ‘on’ in the utility menu, you can enable the midi clock reception for your instrument.

In the Sequencer Setup page, you can set global controls affecting the built-in sequencer of your QS300.
These controls include:
• Click (metronome) settings
• Transposition of sequencer data
• MIDI Sync
• MIDI Control
• Interval Time (for data transmission)
Now the MIDI Sync is interesting for midiclock users :

This setting determines whether the sequencer tempo is controlled by the QS300’s [...]

Synchronizing the MO6 / MO8 with an external MIDI instrument (such as midiclock) is easy.
Execute this key sequence to enable MIDI sync mode :
[UTILITY] -> [F5] MIDI -> [SF3] SYNC -> MIDI Sync = MIDI

The Songs and Patterns of the Yamaha MO6/MO8 “Music Production Synthesizer”
can be synchronized to the playback of most external MIDI sequencers [...]

Midi Clock synchronization on the A4000 and A5000 can be done on the program LFO menu :
Key sequence : [PLAY] Button ? [F6] Button ? Knob 1 to select “PLAY-PgmLFO”
Then you can use Knob 3 to select the LFO Sync method.
This parameter determines whether or not the LFO speed will be synchronized to an external [...]

The Yamaha CS2X is has a midi controllable arpeggiator :
For this arpeggiator you can set the following parameter :
ARP Tempo: MIDI, 40 ~ 240 (beats per minute)

This Sets the tempo of the Arpeggiator in beats per
minute or to be controlled by an external MIDI clock.
So if you want to synchronize the tempo of the Arpeggiator [...]

The Yamaha DTX-MULTI 12 drum unit can be synced to midiclock :

MIDI synchronization (MIDISync) :

Use this parameter to specify whether patterns and the click track are to play at the tempo set for the DTX-MULTI 12 or are to be synchronized with external MIDI devices
based on MIDI Clock messages.
int: Patterns and the click track will [...]

In the SYSTEM | MIDI menu, you can setup the midiclock sync :
Edit the parameter and set it to “EXTERNAL”
When SYNC=EXTERNAL, the SU700 controls song-play timing in accordance with an external clock signal supplied to the SU700’s MIDI IN terminal by an external MIDI device. The SU700 does not output any clock signal.