Lyle,
Tom actually said he would supply a completed version of this kit modified to generate a CV of 0-5V corresponding to the full CC range of the midi expression pedal. He said it also needs a VCA and suggested this (http://www.musicfromouterspace.com/analogsynth/DLLVCA001/DLLVCA001.html) as one possibility. It's just a PCB & parts list, which is hopefully relatively inexpensive to fit out.
On another forum this (http://highlyliquid.com/midi-decoders/md24) was offered as a possible solution. It offers 24 outputs as either logic or servo/PWM for a similar price to the offered Miduino CV kit, so it looks like good value. However, I've no idea about converting a pulse signal into a CV, nor do I really need 24 options to choose from - but it could come in handy to have that flexibility available...
If you have an alternative solution to offer for the VCA I've been shown, please contact me :-)
PS. I really know nothing about electronics, besides being able to solder & whatever I've picked up on a few forums just these past few weeks. So all help willingly received.
Peter Sharp
Ballarat Australia