It was named for its accompanying Moonblaster software that was written to take advantage of the sound card's features.
Moonsound was created and designed by electronic engineer Henrik Gilvad on a semi-hobby basis.
A later version with a larger-sized PCB that fitted into a standard MSX cartridge was also made available.
The Moonsound was equipped with one 128 KB SRAM chip from the factory for use with compressed user samples.
Sound effects like chorus, delay and reverb are omitted due to cost, size and usability reasons.
These programs were also developed and designed by Henrik Gilvad for MSX Club Gouda and Sunrise Swiss.