OK…now I got it.
In the inspector underneath the instrument and preset selector where it says no drum map select drum map setup. Create a new map from the functions menu, double click and rename to RX11 or whatever you want.
Then you can see 2 columns for I-Note and O-Note (In and out) which are freely editable. So you need to work out what notes the RX11 outputs and edit the I-Note for each GA pad you want to trigger.