Magnus Electric Chord Organ harmonium accordion synth

via this auction

"This is a relative rarity I believe. It has one voice, which sounds just like a harmonium or an accordion. It is electric, you have to plug it in. It has a built-in internal speaker and no provision for a separate output jack to put it into a mixer, though I suppose it would be easy to hook one up, we've always just miked it. It has 12 chord buttons on the left - push down and get the chord. The list of chords on the bottom row is missing but they are obvious and if you want to you can place separate little stickers there. The case is made out of plastic and has several scratches as might be expected. The bottom is made out of particle board and has three screw-ins (one is missing) where legs used to be - it no longer has these legs but they would be easy to replace if you desire as the screw-ins look to be standard. We always have used it on top of a desk or QuikLok light-duty table. Everything works - buttons sound chords, all notes depress and play. A very psychedelic sound, especially if you run it through a phase or tremolo pedal." Update via Greg in the comments: "No internal speaker. Runs off of pure air that comes from an internal fan. Just like an accordion."