
Maybe you know midi controllers like phatboy ? ou peavey.... with them you can control in real time audiomulch , rebirth , réaktor and all the softs who accept midi controllers ( most of the soundcards too )
is it a little expensive for you ?
so , do it yourself ! :
what you need :
hardware
1 soldering iron , weld
4 potentiometers of 100 Kohms
a joystick socket 15 pins
1.5 m of cable 15 thread
2 pushbuttons
1 box to assemble it
more and more plugins give the opportunity of using joystick as midi control ,
for example :
or this one
from Daniel Palomo Vinuesa
and you can find more...