[PlanetCCRMA] How to build MIDI intercept code?

[Charles Fox]

I'd like to build the software equivilent of a MIDI intercept box, which 
sits on the MIDI wire, and changes the signals on the wire.

For example:
    1) a black box with a transpose control on it, that transposes the 
pitch of the events on the wire
    2) a velocity controller, that alters the vecloity params of note on 
and off events to match some external input.

What's the best way to structure this kind of project?  Should I write a 
JACK device so I can route my midi wires to and from it?  Is that too much 
work?  I am new to linux audio so please be gentle :)

charles

Charles Fox
DPhil student
Pattern Analysis & Machine Learning
Robotics Research Group
Dept. of Engineering Science
University of Oxford, UK
www.robots.ox.ac.uk/~charles