Comment by lutusp

Ahh ... retro. The many ways by which the past beckons us.

All right. Apropos the retro theme, here's a Web page dedicated to my Apple II program "Electric Duet": https://arachnoid.com/electric_duet/

The gory details: the Apple II had a simple TTL output connected to a speaker -- crude, not meant for music, and certainly not with two voices. Did this stop me? Read on.

I created an assembly-language player that switched the TTL speaker driver's output at 8 kilohertz, then created two musical voices by controlling the pulse width of the 8 KHz clock. So two voices, two notes at once, from a TTL driver.

Here's a sample of the music Electric Duet created, on an Apple II, in 1981: https://arachnoid.com/electric_duet/music_tracks/prelude.mp3 -- press the play button.

That's retro defined.