found it...
I found it via the 'EDIT' menu in the EFFECTS section.
EFFECTS [edit] => PART [scroll to 'INPUT'] => use [value +/-] to change mode to Static or Dynamic.
On INPUT GLOBAL, increase value to let audio through (bypass FX chain, I think)...
You should now at least be able to hear the external signal.. processing / re-routing it is another matter.
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