Red Martian posted this demo video of the Syntar, an extremely rare keytar designed in the late 70s by George Mattson.
“I wanted to post a simple piece first and then later go into much further detail about what the Syntar can do that most mono-synths cannot and why it blows all other ‘keytars’ away.”
Mattson’s company, P.M.S. (Performance Music Systems) manufactured these units, with some work done by EML. There are roughly 8 units built and sold, with a handful of prototypes.
By 1980, though, Moog Music had the Syntar beat marketing wise with its Liberation.