In the early 90’s I was absolutely fascinated by the demo and mod scenes. I found nothing more exciting and wonderful than the concept of creating animated, interactive art and professional, emotional music with an ordinary PC. After cruising local modem BBSes for a few years I decided to be proactive and try my hand at composing my own MOD music. With the kind help of Toronto local MOD tracker artist bObby, I learned to use the free ScreamTracker 3 program for MSDOS to arrange prerecorded digital audio instruments on a sort of hexadecimal staff from 00 to FF (0 to 256 64th notes arranged into four 3F  note bars).
Here’s what one pattern looks like in one of my songs. For convenience and illustrative purposes I’ve taken screenshots using ModPlug Tracker for Windows:
And here’s a breakdown of what the various columns represent:
I’ve recorded a screencast of my second-ever song, Technophrenia, and uploaded it to YouTube. Take a quick look to see how the plotted notes correspond to the sounds produced.
I’ve written nearly 2 hours worth of music over the course of over 4 years under the nom de plume (or is that nom de clavier?) Hypnotic Melody. If you’d like to hear more, check out my Brian’s MOD Music page. I wouldn’t dream of ever charging money for my music, so enjoy, share, DJ, remix, and republish (with my name) as you please.