Hi there
I also found the octaver in the B1on rather poor. Shame, because it’s my go-to travel companion. In actual fact I ended up getting it to work much better than default by adjusting the ‘tone’ setting I think down to zero. I initially ignored it, thinking it would work like a normal tone control but actually it changes the character of the sound in a strange way, it sort of seems to add distortion as you turn it clockwise. In any event, with tone at zero, it sounded much better.