2 stacked knobs volume/balance, treble/bass. it has the Z-mode switch and an active passive switch.
i got it in december to replace the stock preamp because i wanted the option to go passive. my fx pedals seem to work better with passive instruments. it sounds great but slightly changed the sound of my bass which as far as i was concerned sound very close to perfect for my taste. i then realized that i could just have an active/passive switch installed so i took the audere unit out and reinstalled the old preamp.
its in perfect working condition and a great preamp. i would keep it and put it in one of my other basses but im trying to buy a new power amp for my alembic f1x and need the bread.
i also will include the two brand new stacked knobs for the pots. it will come in the original packaging. im asking 120$ shipped.
here is a link to there website to check out the specs: http://www.audereaudio.com/3ZB.htm