You can do this without additional hardware if you are careful with your settings.
The physical MIDI connections would be:
AK Out to OT In
OT Out to AR In
AR Thru to Ambika In
Ambika Out (which is by default a Thru) to AK In
AK Thru to modular In (unless you are not using MIDI to your modular)
Channels/settings:
AK should transmit on the OT’s Auto Channel
Set up MIDI channels on the OT’s MIDI sequencer tracks to avoid conflict with the OT’s audio tracks and Auto Channel. You have seven channel numbers to spare to use with the AR, Ambika, AK, and your modular.
There are, of course, a lot of other MIDI settings to make but it will work. You will have to select the active track on the OT or by using the AK’s keys in order to direct the AK MIDI output to the desired synth.
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