Edit : gnasher1993 beat me to it -
You should be able to use that.
Most modern MIDI devices that don't have a MIDI thru will offer you the choice of switching the MIDI out port to a thru port.
Or will offer a "soft" thru that still goes out of the out port, but is filtered from the MIDI out data.
This can help reduce the need for a dedicated thru box, but it does mean you can loose real time control capabilities when loosing the MIDI out (if you do switch the out to a thru)
Having a multi MIDI thru can really help devices later in the MIDI chain keep up, as MIDI is rather sluggish when dealing with lots and lots of Control Changes, and Realtime Control systex data.
Lets get it straight, ALL Eventide pedals have MIDI!!!
http://www.eventide.com/AudioDivisio...tchFactor.aspx
Click on the "Specifications" Tab.
Edit #2 -
Could you not just use the Tap Tempo on the Eventide, and use MIDI to transmit that to the other devices ?
The MIDI implementation has been improved recently, so the eventide Factor manuals are out of date with regards to MIDI.