udenjoe
4
Without splitter. OT >> Sub37 >> OT >> thru >> rytm >> thru >> A4
Make sure that each has a different midi id. On the A4 and RYTM make sure the auto-channel is different on each. Sub 37 = 9, RYTM = 10, A4 = 11. On the OT you would select that number in the midi sequencer to trigger or record that device using the sub37 keyboard. You will also be able to press record on the A4 or rytm to record on their own sequencers using the sub 37 keys.
You may have to have patience and change the ids around a bit to get it right. Start with the OT and sub 37 first only, then start adding the others.