This is a monophonic midi sequencer that uses text and converts it to midi notes. It does a good job making really long monophonic sequences easy to write, and is used as a live music experimentation and composition tool.
the interface is ... your favourite text editor.
You will first need to install node.js https://nodejs.org. cd to the folder, and run this command:
// params: text-file bpm [grid] [debug] node sequencer pieces/war-and-piece.txt 120  [debug]
Open the text file
pieces/war-and-piece.txt and edit some text, save, listen to
the sequencer play the updated sequnce once it gets to your changes.
You should now have a new virtual MIDI device called "Text Sequencer", you can now route it to wherever you want.
The letters are mapped to notes directly as their ASCII value, reference: http://www.asciitable.com/
This sequencer does not have velocity or note length, but these are really easy to program/control yourself from your Hardware or DAW.