Cheers if you have a Quickie do give it a try it would be really interesting for comparison with the Quicksand.
The ACA attenuator is a Valab 23 step 100k (its was just what I had to hand in my parts box) The Quickie box was a real pain its just some coloured veneers glued to a mdf. It took ages to cut and glue the strips and I got fed up and left it on a number of occasions. Its one of those things that looks good from far, but is far from good.