I've spent the last month getting to know my new Europa, and learning the wonders of the LPF and Q. I like it. Not better than my Epic B/T, but different.
I have had a Bartolini hum canceling jazz pup in a custom bass for about 6 months now (passive), and I put a Tonestyler LPF (also passive) in this bass when I first got it. Playing it tonight for the first time since I got the Europa, it was obvious how similar the Tonestyler was in it's affect on the basses output.
I am not suggesting that this device will give you the Alembic sound on your passive instrument, but in the vast universe of bass tone, it puts you in the same galaxy.
I would guess that anyone who likes the Alembic sound, and has a passive bass with a traditional tone rolloff, will consider a tonestyler a huge improvement.
No, I'm not a rep, I just wanted to share this evenings realization.
JBY