Re: Keeley Modded DS-1 users.....
I currently use my Keeley DS-1 for all my dirty sounds live. I have used it with a slightly dirty JCM800, as well as several fully clean tube and solid state amps. I can't really give you any other tips than that what the box really excels at is dirtying up and pushing an already slightly gritty tone. It is however also quite good as a pure source of distortion.
I've compared it to a new DS-1, as well as a late 80's stock DS-1. In my ears it was smoother and more musical sounding than both of the other boxes. The 80's box had a similar mojo quality to it, but that may just have been my fascination and love for older gear.
It is however worth noting that when I play with people using the two other boxes (they are owned by two of my former band mates), they will generally have a slightly more cutting sound. I think this may be because the Keeley is slightly fatter sounding, and therefore "sits" more into the mix.