@Adam_G
Soo...
I took a look at it and saw you also had a short forum talk with Christoph.
I haven't found a way to unlink them (even though, there is probably somewhere a possibility).
For me it mostly begs the question, is there another way of achieving, what you wish for without macros.
If I understood correctly, you just want to switch from a predefined value(automation, sine, .... whatever it may be) to custom control via a button.
Is that correct?