Vector synthesis keyboards combining FM and AWM sound sources.

That Soundblaster video game sound in a mid-80s home keyboard...

Yamaha Portasound FM keyboards from circa 1989.

Full-featured FM Yamaha Portasound keyboards from circa 1988/89.

A Portasound from 1989 with a more sophisticated set of voices than its predecessors.

A rare and unique pre-FM Portasound from 1983.

The original Portasound from 1980.