Below you find some links to MIDI resources. General MIDI Links   Songstuff MIDI format information including a description of MIDI messages. Songstuff provides a source of MIDI information, MIDI links and MIDI discussion in the Songstuff forum. Midiworld MIDI files, information on synthesizers, and more! Massiva A very, very nice freeware MIDI and audio sequencer by Jørgen Aase. Maybe not as powerful as its big brothers Cakewalk, Cubase, Logic etc. but It's free It has a lot of non-standard ways to compose It supports VST It has a built-in softsynth(!) It has the most elegant interface of all sequencers I know Hubi's MIDI loopback Add up to four (virtual) MIDI In and MIDI Out ports to your setup. Any In port can be connected to any Out port. Freeware. Maximum MIDI MIDI Programmer's toolkit for C++ programmers. KeyKit The ultimate MIDI environment. A VERY flexible, programmable MIDI program. Offers lots of library functions and some basic editing tools; what is missing you can build yourself (programming knowledge needed). And.... it's free! MIDI Tools Are you technically oriented? Then you might want to build your own MIDI controllers, ear-training tools etc with this toolkit Algorithmic composition   Music in the Numbers A very nice algorithmic program from Lars Kindermann. Quasi Fractal Composer A MIDI program that uses fractal "self-similarity" functions to compose songs. IMO very "natural" sounding results. Tangent Tangent is a "top-down" composer that works with musical structures, not individual notes. It builds a composition by creating periods of bass and polyphony. It does this automatically but still allows user control. It can even take a simple melody and create an entire composition. Softstep SoftStep is a Windows 95/98/2000 based modular MIDI step sequencer patterned somewhat after the modular analog step sequencers.