MINI-SYNTHY by T. Danko M3 emthree

via this auction

Googlish description:

"That thing is called 'Mini-Synth' and I must really be extremely rare. It is probably something like an effect unit for guitar or something. Power supply must be installed as a 9V battery.

And how does that sound now? Difficult to describe. Is probably something simple like a synthesizer for guitar?

If you put into it when a guitar input and the whole thing connects to the amplifier, well, I'd say the guitar signal in such a way Square wave and converted into three separately controllable .... Broken octaves or so. Then there there's a hard-soft switches. Since I do not really know what you want, for me it sounds more like a loud-soft.

I think that was once intended as a substitute for synth-guitar bands.

The unit has a sturdy metal casing and looks pretty good, I would say almost as good as new. Perhaps what strange effect devices for collectors.

Another note for the fashion-conscious guitarists: You can wear the chic device at the belt! (At the back are hooks)"

See the T.Danko label below for more.