Take a look at the Basswitch IQ DI. Besides a lot of features, it can be used as a clean boost. It sounds very transparent and really is an amazing pedal! The EQ section is just unbelievable!!! Check it out @ Invalid Link Removed
Greetz, Flow
Nice looking, but a bit pricey! Nice EQ is important though... I would love something that gave really fine control of the bass end, e.g. a para EQ sweepable between 20 and 80 Hz. (Maybe that's someething for another thread!)
The reason I got rid of a similar unit, the EBS Microbass, is that the bass eq curve seemed too wide and the center too high.