Using vMix presets, is it possible to lock in the focus point using PTZ Optics cameras? PTZ Optics says that using their presets, this can be done; but they think that vMix uses is different method of saving presets.

We have a couple of spots that we zoom in on, but because of lighting (I think) if the musician moves much, it goes out of focus. I'd like a way to lock in the focus so it doesn't shift to autofocus when moving to that preset.