CMU Midi Toolkit for Unix machines. Note that not many unix systems support MIDI or offer real-time processing, so CMT has limited value on Unix machines. There is code here for an SGI port that I haven't tested, so let me know if it works. Also, at CMU we have drivers for Mach, RTMach, and AIX on RS/6000's. I do most of CMT maintenance on the RS/6000. There is a separate readme file in the tar file about setting up and running cmt.