Mr Schwa, XY pad work great for track volumes..:
eg 1/volume/1,2
however fx paramater are working odd, i can only successfully control params on the 1st track of master (as is the fashion)
this goes for plain sliders too.
eg for a test i set:
DEVICE_FX_FOLLOWS_FOCUSED n/yo
and sending from device /yo/fxparam/N
device only controls param N of 1st fx on master, no matter what is selected or focused.