Elektron Musical Instruments

Can the monomachine joystick be fully substituted with an 
external controller (particularly in the case of the tabletop MM)?  
For example, could I use the X-Y pad on a Roland V-synth to 
emulate the joystick, including recording joystick movement as 
part of a Monomachine pattern?  Can the tabletop MM save 
joystick assignments as part of the patch even though it doesn't 
have a joystick?

(Hopefully the questions make sense, as I'm not entirely sure 
how the joystick is set up to work in the broad scheme of things 
on the MM)...

Thanks...