If the AR is the master and the OT is the slave, you can set up your system so that pattern changes on the AR trigger pattern changes on the OT by setting the following:
In the OT’s PROJECT > MIDI > SYNC menu, enable PROG CH RECEIVE and set the related CHANNEL setting as decsribed on pages 42-43 of the manual.
In the AR’s GLOBAL > MIDI CONFIG > MIDI SYNC menu, activate PROG CH SEND. See pages 54-55 of the v1.30 manual for the AR.
In the AR’s GLOBAL > MIDI CONFIG > MIDI CHANNELS menu, set PROGRAM CHANGE OUT CHANNEL to the same number that you set up on the OT. See pages 56-57 of the v1.30 manual for the AR.
The AR will now send MIDI Program Change messages to the OT to change the OT’s patterns.