The gadgetina is a homebrew musical keyboard based on the MIDI Gadget by Paul Everett which was itself an electronic facsimile of a Hayden Duet concertina. All three instruments use the Wicki-Hayden key layout.
Here are some videos of the gadgetina in action:
In Dulci Jubilo (BWV 751)
D. Scarlatti Sonata in D (Tempo di Ballo) Kk. 430
Toccata in d, BWV 565 (organ version)
Toccata in d, BWV 565 (synth version)    

D. Scarlatti Sonata in C (K. 159)   

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