Apple 0 for sequence settings, under audio outputs set to 4, either dual mono or stereo, depending on your needs. Then on the left pane in the timeline, right click and assign to output busses. Then check if you have 4 audio channels going to tape. If not, option 6, make sure the stereo downmix button is off. You may have to go to your Aja or bmd presets under device controls and set that to 4 tracks.
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