Discreet 4 channel Audio with AJAio - SDI to D-Beta

I been asked to deliver a stereo mix on Ch 1&2
and
a split mix on 3&4
I would do this in 2 passes on a MC (insert edit on second pass)

Suggestions?

I'm assuming you have audio on 1 & 2 only. Copy your audio tracks to channels 3 & 4. In Sequence>Settings...choose the audio outputs tab and set channels 1 & 2 to Stereo and channels 3 & 4 to Dual Mono with downmix off. When you assemble or insert the clip make sure downmix is off in your Audio Mixer tool. I use a Kona3 so I'm not sure about the AJAio, but it just needs to pass four channels of audio so...