Looking for someone that can give me the sound I achieved with my Jaco-Style 4-String Series I but on a 5-String Signature Deluxe.  
 
Bottom line... Jaco-Style!
 
It has a sweet sound fretted. Experience has taught that frets limits the Alembic's capabilities with the type of music I prefer. If it doesn't sing, it doesn't ring...
 
in the heart
 
I'm ready to open it up and find out what it can do. Baltimore Area Preferred! Your Hands - My Hands! We'll/will Agree! With a little help from the ears.

Hello and welcome .  
Do you have any pics of the Series I Jaco -Style 4 string ? Did you have the fingerboard epoxy finished ? Was it lined ?   What Body shape ? A picture is worth a thousand words ____

Sold the Series I to Craig Schwartz back in 1992. He was a big collector of Alembic Basses back in the day. Have been looking for him but haven't at this point.
 
Here's a pic of the Signature.

In my opinion, the start to getting a Jaco like tone out of an Alembic is to emphasize the bridge pickup, set the bridge filter about 1/4 open and maximize the q switch or cvq on the bridge filter.  The neck pickup and filter should probably emphasize bassiness but in a very subtle way.  From there, I think it all comes down to technique and wood recipe.  I am no where near a Jaco like talent player but have heard others play my Alembic and have it sound very Jaco like.  This is even on my fretted Europa 5 string w/ Series I electronics.  My guess is you can get something close on your MK5 pictured above (BTW, one beautiful bass).  I suppose if you were to de-fret it, that would take it the next step (although I like the looks of it as it is).
 
I hope this helps.
 
Bones

I've thought of selling it because with frets, it serves a purpose far less than its potential in my musical realm. Then whalla! Grind down the frets to let out the beautiful fretless sound. It is somewhat of a dichotomy literally damaging its original intent and beauty, but it would translate well for me in usage.

When it comes right down to it, it's your tool to make the best music you can from it.
 
Have fun,
 
Bones