Pentatonix voices sound very clear and good.
Does someone know who mixes for them?
And also I am curious that what kind of program/DAW do they use for their production?
Ben Bram is the primary producer, arranger, and recording engineer for Pentatonix. Besides being an a cappella performer himself, he has extensive experience working with various groups and Hollywood shows.
I have no idea what software he uses in recording. I did some searching of his Tweets, but I didn't find any mention of his recording software.
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While at the time this seemed like the right answer, the citation included in ctate's answer explicitly describes Boyer as the mixer, Bram as the producer/arranger. – Chris Sunami supports Monica Aug 7 '17 at 12:16
I didn't think Bram did much in the way of mixing, at least not since the earliest days. He gets an "engineering" credit on PTX Volume 2 but not a "mixing" credit, for example.
One of their long-time mixmasters is a guy named Ed Boyer, who's been in the business for a very long time. See for example the Sound On Sound article about his workflow, with specific examples from the eponymous "Pentatonix" full-length album. It goes into a lot of detail about both hardware and software, mic selection, aesthetic choices about pitch and intonation correction, et cetera.
There's a lot of suspicion that Pentatonix uses pitch correction - manual or otherwise - on their recordings, but there's no evidence of that. While to many their recordings sound auto-tuned, I've learned that there are supremely good musicians out there.
Their producer, Ben Bram, produces a lot of a capella groups, and I imagine if he does any pitch correction at all, he'd keep that a closely held secret. (It would be a bad business move to do otherwise.)
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1They all have wonderful natural voices --you can hear that in their early pre-fame YouTube videos. Of course, that doesn't mean they don't have studio help now... – Chris Sunami supports Monica Jan 27 '16 at 17:11