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Craig, off topic but can you ask the Tascam driver writers if they are working on UH-7000 drivers and whether these can or will be able to be aggregated w/ the newer units.
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I'm pretty sure you can aggregate them already using WDM, but I don't have the UH-7000 here at the moment to verify.
As to drivers, I can ask but there is a fundamental difference in that the UH-7000 includes onboard DSP. The US-2x2/4x4 do not; the materials cost went into the mic pres, adding a MIDI interface, and the enclosure. So I think the UH-7000 drivers would have to be rewritten more or less from scratch. They did do driver and firmware updates last summer (including Yosemite compatibility for the Mac) but these were updates to the original drivers.
I tend to think TASCAM saw the UH-7000 more as premium mic pres for capturing stereo audio that could interface with a computer, and as the current drivers work for that type of application, I don't know if there's a lot of demand from the current user base for lower-latency drivers.