Beside what David said - yes, someone did it already:
http://www.cs80.com/SSK/ Ok, it is not for the polyphonic series,
but it shows, that is doable, and also that it would provide other
advantages, like adding MIDI.
On 16.01.18 18:39 , jonathan4051@... [yamahacs80] wrote:Has anyone ever looked into modern alternatives for these fragile and rare 40-year old chips? I am wondering if it'd be possible to program an Arduino to handle key coding/assigning and D/A conversion on the KAS and KBC boards.
Cheers,
Jonathan