mididebug.lv2 is an instrumention tool to generate arbitrary MIDI messages up to 3 bytes in length. It's mainly intented for http://moddevices.com/ but works in any LV2 plugin-host.
Compiling mididebug.lv2 requires the LV2 SDK, gnu-make, and a c-compiler.
git clone https://github.com/x42/mididebug.lv2.git
cd mididebug.lv2
make
sudo make install PREFIX=/usr
To build the the MOD GUI use make MOD=1