"Seth and I have deep differences," he said. "We've known each other since the beginning of our lives, and our differences started years ago."
Those differences, he said, get aggravated when mixed with long tours, the wear and tear of life and maybe a little substance abuse.
"It all leads to some great arguments."
Avett said he and his brother are certainly still cable of that, but they've become a lot more aware of how they feel toward each other and try to give each other space. However, just because they have their arguments and differences, there's a lot they can agree on.
Avett said they're both proud of how the band came through this past year, after standup bassist Bob Crawford temporarily left the band to tend to his 2-year-old daughter, Hallie, who was diagnosed with a brain tumor.
"It was very difficult," he said. "It was bittersweet. We learned a lot, and when we came back together, I think the whole band came back much stronger, much more equipped to deal with any hardship like that."
Avett considered it slightly less of an accomplishment, but still noteworthy, that the band managed to get its new album, "The Carpenter," released during Crawford's hiatus. It's the band's second record with super-producer Rick Rubin.
Rubin arrived in music in early 1980s and helped bring hip-hop into the mainstream. In the past 30 years, he has worked with a veritable who's who of major mainstream recording artists including Kanye West, Johnny Cash and Adele. Rubin won a Grammy for his role as producer on Adele's, "21."
Still, Avett said the band isn't looking to go more mainstream exactly.
"Nobody has discussed it," he said. "Seth and I have just always wanted to improve what we do and just make better art."
Avett acknowledged what constitutes better art is open to interpretation. Sometimes better art means staying away from the mainstream, but often it doesn't.
"It doesn't take the art educated or the music educated to recognize great things," he said.
And with Rubin, Avett thinks they are making great things right now.
Crawford is back with the band. His daughter's condition is much improved, though she's not cured yet, and Avett said all of them are looking forward to a busy year.
"Our return," he said. "We're just excited to be back."
Reach Bill Lynch at ly...@wvgazette.com or 304-348-5195.