Yep. In advanced output create two slices from the same area. Assign one to each of two sdi outputs. On one tick the "is key" option and voila. Thank you so much! Do you know if this has support for hardware such as the blackmagic ultrastudios? In ProPresenter we can use the "A"...

Is it possible to use Arena to send a separate alpha key out over SDI? I saw another thread asking about taking alpha key in over SDI from ProPresenter, but was hoping to be able to layer things over IMAG without latency.