[sdiy] EDP gnat keyboard

[Dan Snazelle]

been looking at the wonderful hand-drawn schematics of the EDP gnat A lot in the last few days. it seems wonderful 
to me that this entire synth is created with totally available parts. 
I was wondering...on the keyboard multiplexer...
do the 4051's connect directly to the keyboard? 
and if so...what IS the method of keyboards giving a gate signal?

is it simply a button underneath a key "button" or is it a resistor chain like in a regular keyboard?  (ic10,1c25,1c33///those are 4051's right?)

thanks 
and thanks to TIM for  drawing those schematics! 

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