Having recently picked up a Tone Hammer I no longer really use this pedal. Previous to owning the TH I had an Aguilar DB924 pre amp and the EWS was the mid control I used. This is a very compact, very powerful pedal which allows the user to select theirs preferred frequency which they can then boost or cut.
I never really went in for active controls preferring passive basses but the Aguilar Db924 added a really nice boost to the bass and top end while the EWS allowed me to focus the mids. I also used it with a BB bass pre amp for the same function (it was in line after my A/B switcher so I could switch it on or off depending on the part I was playing, clean or dirty) I found myself leaving it on for the whole gig which is why I got a tone hammer!
See the website http://ews-us.com/item_bassmid.php
and there are many youtube videos too!
This is probably one of the single most useful pedasl you can own regardless of the style of music you play - As I have semi-parametric mid control on the TH I'm sadly no longer in need of this.
£120 delivered next day as soon as the Post office reopens!
Cheers for looking