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It wasn't a hard choice to spend a few extra bucks for the QU. I considered the StudioLive, but it looked much less sturdy, and I knew I liked the sound of A&H preamps over Presonus. (I would have used some of them for returns.) It's a great mixer I am happy to recommend it, and I definitely suggest the QU-24 (or 36) for the extra channels.
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I also have a MOTU Traveler I keep handy for my digital I/O needs and a Apollo Twin for extra signal-processing during mixdown. Most of the critical shortcomings I can handle in my DAW when I use the QU as an interface. I also haven't figured out how to side-chain the channel compressors. It somewhat compensates for that with the excellent output matrix, but lacks corresponding return inputs. The only shortcomings of the QU are the dearth of standard digital I/O and the lack of inserts. It is outstanding for live, and a very good studio mixer/interface. The sound is excellent, the signal processing and effects are very good, and it is built like a tank. I bought a QU-16 and I use it both for live performance - where I record straight to USB stick at 24-bit - and in the studio where it functions as an audio interface with lots of extras.
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