I was thinkikng about doing some mods to a couple of my basses one of which is changing pre amp. is there anyadvantage I am missing by changing the on board pre in the basses i,m working on compared to using the tone hammer and having it for use with multiple basses. from what ive read the tone hammer is the same as the onboard opb-3 in a pedal. sorry if this maybe should have been in effects.

IMHO, outboard pre's are great. Although I now have an OBP-3 (in my Valenti), a Sadowsky onboard pre (in my NYC P/J) and a Lakland Korean Pre (in my 55-01 Deluxe), I started life as a strictly passive player. Then...

One day, I read a review of a tech21 pedal (the notorious Compactor) in Bass Player Mag. I got one because I wanted to try a compressor in my quest for Jamerson tone from my '71 P-bass while gigging with my horn band.

That pedal opened my eyes to outboard EQ. I used it with EVERY passive bass I had, including my upright and a Jazz. Soon, I had a Sansamp ParaDI (awesome for any passive application, from fiddle to Jazz bass, from upright to P-bass). It kills with piezo pups.

So, IMHO, although I like the OBP-3 a lot (!), I'd get the Tone Hammer in your situation. Try it with every passive instrument you have. I'll bet you find it useful. Ask Munji. :ninja:

but can it be used on an active also if i just set the bass itself flat.i have a squier deluxe v and a esp 4 string both of which are active a squier vm and vm fretless and would want to use it with all of them if possible

With active basses, two concerns: excess gain and noise. You may find it easy to overdrive an outboard pre with an onboard pre, and yet another pre-amp has got to add at least some noise. YMMV.

None-the-less, it is no doubt doable, just like adding another effect pedal--just watch the gain.