I'm looking for a new audio interface that is mobile. In the end, I'm still undecided between the two.

One, I like because it has a build in microphone which supposedly is really good, but it can only record in mono.

Duet sounds better apparently, allows for stereo recording but it has no microphone and costs twice the amount of the One.

So, how much better is Duet than One? Is there any news about a new Duet that will also have a build-in microphone btw?

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the duet has the same converters as the ensemble, it is definitely worth every penny. I would def go with the Duet.