basic is what it says on the tin
It's a limited feature synth, with 3 oscillators fixed at pulse, saw and triangle respectively. It is loosely based around the SID chip famous for that Commodore 64 sound, although basic is not even as featured as that.
It is deliberately basic, partly to get that old tech, lo-fi, 8 bit, computer game sound, partly to challenge you to get some interesting sounds out of a less-than-vanilla synth, mostly 'cos I'm a simple guy.
http://www.delamancha.co.uk/basic.htm
http://www.delamancha.co.uk/plugins/basic.zip