I've literally bought 2 different used line6 fbv3 from 2 different guitar centers within the past 2 weeks and both fbv3s have the same problem when plugged into my spiderv 120hc mkii amp head. But when I plugged in my old fbv shortboard mkii the pedal turning the volume up and down worked and so did switching it to a wah pedal and using it for a wah.
I've called line6 3 times about this and none of the customer service reps seem 2 know this is a re occurring problem for there customers with the fbv3. Especially when we pay all this money for lollipop that doesnt even work the way it's supposed too.