[sdiy] How do duophonic keyboards work?

Phillip Harbison alvitar at xavax.com
Sun Aug 10 08:52:32 CEST 2025

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Michael E Caloroso wrote:
> US patent 3,733,955 covers the duophonic keyboard for the MuSonic (later 
> Moog Music) Sonic 5/6. ...
Thank you!

-- 
Phil Harbison

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