Should be doable, by setting ANALOG IN/OUT to IN. If I've understood the signal flow correctly, this will output the ob signal into the AH, and to the outputs of the device. From there it's just a matter of running into the stereo insert device of your choice, and back into the AH inputs, which should then get routed back into ob. If the analog i/o setting is IN only, this should not result in feedback?
If I got this wrong, this should still be possible by a dialing in the appropriate setting for the ANALOG IN/OUT setting. Too little hours with this thing so far for me to feel I got everything 100% correct