Elektron Musical Instruments

A cursory search of the message archives did not reveal anything, so I 
am asking the list.

I have purchased an SFX-60, which I dearly love for its sound and 
portability.  I can get away from the computer over lunch and write on 
it, in my cube.  Very nice.

However, the functionality of the SFX-6 joystick seems to be part of the 
overall Monomachine experience.  At home, I hook up an Oxygen 8 to the 
MnM, and that works very well.  I would also like to hook up a MIDI 
joystick.  Could someone recommend a product that can replicate the 
functionality of the SFX-6 joystick?

/Scott