Hi Pauline,
I bought this some years ago and didn't particularly like it. As Geeg says, just a bit of practice on those lines and you'll wonder why you ever thought about trying it. I do believe you actually get a bit of a yellow line there when it's used but I could be wrong.
Anyway, this is just my opinion of it - some people here may have used it and loved it. It's called Line Out and you can buy it from NSI.