Tchu
3
MIDI routing :
EO Out > OT In
OT Out > Rytm In
Then, on the OT, you can use a MIDI Track to pass the MIDI data of the EO to the Rytm (send on the MIDI Autochannel of the Rytm, I think).
or
You can use a MIDI Merge box :
EO Out > OT In
OT Out and Thru to the Merge box
Merge box Out > Rytm In
Use the OT to be the Master. Only the OT and the Rytm need to be synced and clocked. So, set the OT to send Clock, Transport and Program Change and set the Rytm to receive them.