Thanks for mentioning Kaseq. I thought that nobody was using this program anymore. The problem with Kaseq is that DCOP is deprecated. I'm planning to migrate it to DBus and release a new version some day, time permitting.
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It is easy to make this utility in C++ with Drumstick, like the attached one. The destination is hard-coded to "KMidimon:0", but I'm sure that you can change or add your own MIDI interface easily. To build it, you need to install Qt4 and Drumstick development libraries first. Put both files: sndpgmchg.pro and sndpgmchg.cpp, at some directory and compile the program using the commands: