ark
22
I would like to suggest the Roland Octa-Capture or Studio-Capture interfaces. They are substantially less expensive than Apogee, RME, etc., but appear to have good converters and very low latency. The Octa-Capture is 8in, 8out; the Studio-Capture is 16in, 10out.
Two features make these devices particularly useful for your purposes:
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you can use either of them as a mixer without the computer connected at all. It’s kind of fiddly to do so, but it’s possible.
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if you need more channels, you can add a second identical device and treat the two of them together as a single audio interface with lots of I/O.