When I think of colored sound I think more along the lines of muddiness...Like it doesn't necessarily "distort" the sound any more...I wouldn't consider tightening the response as coloring. Hard to explain without clips...I will see if I can get some comparison clips up here sometime soon. Perhaps I should say..natural or organic boost?
Like I said...it is pretty much a tubescreamer style with a few unique modifications. So what you get from a od/ts-9 or 808...you get from this but it seems to add some clarity that I didn't get from my ts-9 and od-808. It is definitely something to try...even though it has the evil krank logo on it
I apologize for my lack of ability to portray sounds through words.
wondertone has some crappy clips of it...but not as a boost(which is what most people want to hear).
http://www.wondertone.co.jp/products/krank_soundclip_4.htm