No gates when input source is expansion card eg DANTE

Just got my fantastic gld112 desk with my iLive IDR48 over Dante which works great and am well impressed. However, in my connection scenario, I can’t gate the inputs. When I take thin ins from the option card I only get the option to use trims on the desk rather than gain and this appears to prevent the gate function. Not too much of a problem in practice however it would be nice to have. Early days for me on this desk so I may have missed something so any suggestions?