Causality 4 MkII query

[Kipper4]

So I built the Causality4. It's a nice Phaser too.
From this thread
http://www.diystompboxes.com/smfforum/index.php?topic=80456.0
(feel free to remove the link Mods if it's not welcome)
schematic on page 6
I also built the additional stages mod on the same perfboard.
Heres my question
Can I make the additional stages switchable and if so how please?
additional stages mod on page 12
Thanks
Rich

[Scruffie]

Of course you can, you can use the same switching as the pedal bypass switch so you're just true bypassing the added circuit board.