Passive A/B/Y

[Mudfuzz]

Hello, again.
Can a Y switch be added to a passive A/B selector? like this one

And if so how would you hook it up?

Thanks

P.S. I'm sorry if this has been covered before, I did search for some time, but didn't come up with a answer

[fixr1984]

Try These

[ambulancevoice]

dont forget the 4.7k resistors before the led anodes (9v+ - 4.7k - Anode)