Going back to the topic[1], here are some more links I had in my bookmarks:
Touchpad 2 Midi <http://www.livelab.dk/touchpad2midi.php> (it seems it's
free but not as in freedom)
fijuu <http://fijuu.com/> : Fijuu is a 3D, audio/visual installation. Live
perfomance using a PlayStation-style gamepad
[1] I would like to achieve something until I buy some decent interface
2009/10/12 Carlos Sanchiavedraz <csanchezgs(a)gmail.com>
  Hi Michal,
 2009/10/12 Michal Seta <mis(a)artengine.ca>
  Hey,
 Here's my take at adapting a USB joystick (purchased second hand, $20
 for a pair) as a "controller" for my guitar.  I actually performed
 with that thing.  The thumb sticks were replaced by photocells so that
 by waving my hand in front (and changing the intensity of light
 reaching the components) I could control some continuous parameters.
 The buttons of the pad were mapped to various things, depending on the
 "preset".
 
http://tinyurl.com/yzgrzvp
 It was all hooked up to pd in which most of the audio processing took
 place except for some presents where the buttons controlled a
 sooperlooper instance via OSC.
 
 What a guitar-attached-controller! ;) It might be good for controlling fx,
 but maybe a little tricky to start recording a loop at the time you play
 with your right hand.
 Anyway, really nice. Do you have the project available.
 I have now decided to give up the USB joystick on that instrument and
  try to figure something out with the wiimote
which is a lot of fun to
 play with.  The other usual contender is an iPod Touch/iPhone even if
 mostly used in connection with OSC.
 Have fun digging, there are a lot of fun projects around.
 
 Talking about wiimote and MIDI, keep track of a project I'm involved that I
 mentioned some time ago, wiimidi:
 
http://github.com/fontanon/wiimidi
 It's in its first steps, but I hope at the end it would be really easy and
 useful for every kind of user.
 Thanks.
  ./MiS
 On Sun, Oct 11, 2009 at 1:36 PM, Carlos Sanchiavedraz
 <csanchezgs(a)gmail.com> wrote:
  Hi dear folks.
 I would like to do some kind of a survey to know about configs, setups,
 controllers, etc that you have come to over the years and based on your 
 own
  experience. (Well, I already know some of yours
for your mails on the 
 list)
 It's usual to see piano keyboards and controller boards, i.e. Behringer
 BCF/BCR2000 or FCB1010.
 But more than this kind of consumer products, which I know many of them, 
 I'm
  rather interested in something like (inexpensive
and) strange MIDI
 controllers, pedal boards, Arduinos, DIY HW... that allow controlling 
 and
  have interaction with applications, whether
it's Ardour, Rosegarden,
 Freewheeling, Sooperlooper, Pd, Supercolider, Mixxx ...
 Why this? I've been willing for a long time now to buy an audio 
 interface
  with MIDI and maybe some controller, but at the
moment I'm still stuck 
 with
  just my keyboard and mouse; it's ok with DAWs
but an inconvenient when 
 using
  live loopers (most of all when playing guitar,
and without a MIDI
 interface).
 Thanks in advance.
 --
 Carlos "sanchiavedraz"
 * Musix GNU+Linux
  
http://www.musix.es
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 --
 Carlos "sanchiavedraz"
 * Musix GNU+Linux
  
http://www.musix.es