Here is an amazingly odd portable keyboard called the Orgatron. It may have been a kit from the 60's. It is a monophonic keyboard with two sound settings and tremolo. It has no output, just an internal speaker. It is an octave and a few more keys. Totally a strange bird but sounds so good and messed up from the get go. I used this on a Coctails track on "Let's Enjoy - The Coctails", the Japanese 10" EP.