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Seems like the Korg NTS-1 fits in this thread:
https://www.youtube.com/watch?v=61PjqJ8cRec
There's a DIY element like the Gakken, in that you have to assemble it yourself. It's got a ribbon controller like the Monotrons. Also it's small (although it's powered over USB not batteries but you could use an external USB battery pack).
― just another country (snoball), Saturday, 18 May 2019 09:51 (four years ago) link