Just follow this example:
http://www.sparkfun.com/tutorials/152

You can control any digital or analog output from your Touch.
I don't know how to control Midi, but certainly that's possible.
What are you trying to control in the end?

I've got this working with Arduino.
Looks like exactly what you'd like!
http://hexler.net/software/touchosc
http://itunes.apple.com/us/app/touchosc/id288120394?mt=8

They seem to be the most popular on Ebay.  What is it strong enough to move?

It is very low friction.  The felt is small and only glued to one side.  Like this:


My friend has built it.  I have "felt" how easy it is to pull.  But I do not yet have the stepper motor to try it.  That's why I'm asking.  Before I purchase any hardware.  What do you think?

I'm making a DIY Timelapse Slider for Canon 500D DSLR, which weighs under 2 lbs.  It involves PVC pipes with felt between them to minimize friction.  I was planning to use a small diameter pulley with a string or fishing line to pull the camera: Like a pen attached to the stepper motor shaft.  It has 64:1 reduction.  I'd like it to travel 2m.  The friction torque is 1500 gf*cm. 

Will the 28BYJ-48 be strong enough to overcome friction and pull it slowly when it's level?

Any advice on how to make the pulley?  What problems will I need to overcome?

Why does the ULN2003 have 7 drivers?  When we only need 4?  8 would make more sense then it could drive 2 motors?

The author says no changes are necessary.  Can anyone verify this?
My chipSelect pin is not the default...

Great minds think alike?  I've tried it.  But I have not tried the 2 solutions together yet.  Does the case have to completely enclose the audio board without any small openings?  Or just get between them.

@fat16lib - Can I use your WaveRP library with this hardware?

http://www.ladyada.net/products/microsd/
I don't have the Wave Shield.
Where do I modify chipSelect like in the above tutorial?
Mine is not the default wiring.

I have built a mic preamp which works using analog input.
So I can record.
I could not play the files?
What do I need to change in the WaveRecordPlay example sketch?
What options can I change in that code?
What's the difference between SD and SDfat libraries?

Great idea!  I already tried it.  It was insignificant.  Somehow it's coming thru the signal wire?  I had more success by changing the distance between the 2 boards.  If you get it just right, it's better.  But unpredictable.  My best solution so far is to record the audio to SD, then send it when you're not recording.  But that changes the functionality entirely.

The problem is not the power supply, in fact it's the opposite of what you guessed.  I have tried a battery with the XBee method of sending data.  The problem is the RF square wave being picked up by the Mic.  I have tried a different circuit entirely before I purchased the Sensible Mic.  I am using USB to transfer data instead of XBee.  The power is not the main issue.  Or the noise coming from USB power is much smaller than RF.

Subtract 20, then multiply by N.  Check to make sure it's not over 1024, which should be rare in your case.

Yes, the response may be only 1/2 the numeric value in the low end.  You can easily fix this with software, just multiply the value by any number you like!

I am not familiar with the RAZR as a phone user.  Forgot programming and Arduino for a second.
What keys do you press, as a phone user, to send a picture?

I'm using this Mic:
http://www.ebay.com/itm/120809936867

And transmitting the data with XBee Pro.
The hum is awful, louder than most audio in the room.
It's a square wave at about the data bit rate.
Unless I use a USB cable, then it sounds perfect.

Any suggestions on how to fix this?
I've tried a few ideas, and so far only 1 is a success (with limitations).

This works nicely.  I'm using it.
http://www.ebay.com/itm/120809936867