The Commodore 64 is renowned for its sound chip, the legendary SID chip. Still Commodore decided to release an external soundcard for the C64 in 1985.
The SFX Sound Expander is sound device based around the Yamaha YM3526 OPL FM-chip, which would later find its way onto PC soundcards like the Soundblaster. Plugging the device into the cartridge port of your C64 added seven channels of FM capabilities. But while FM allows for more complex sound shapes, it doesn’t really make sense to use it.
In this video we visit Clemens his home recording studio to thoroughly check out the SFX Sound Expander.