There's no calibration on the Signature electronics in your bass.
I can't tell if you changed the battery from your post. Make sure you try a brand new 9V battery to eliminate it as the problem, as distortion is a symptom of a low battery.
Next, make sure you isolate the problem to the bass. Try it with at least one other amp to make sure if you have one available. Maybe the gain trimpots are too loud for your amp? You may want to turn them down.
Otherwise, please email me at
help@alembic.com to set up a time that dad will be available to check out the electronics. Even though you're only an hour away, it's best to make sure he'll be here when you'll be here.