Thanks Andras, yes I know I could, I was curious to understand if a solution including $0 could've been possible.
That's probably the way although I should modify all the abstraction created so far one by one or editing with nano, but that's not straight-forward either.
Maybe i'm overseeing something, but cannot you create named instances like
[my.chorus cho1] and use $1 instead of $0?
Andras