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Fabian Schlieper
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Fabian Schlieper

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Very nice. Have you done any measurements on latency?
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Fabian Schlieper

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Nice work! Did you do any measurement on latency?
Also, are you running the USB with 1.1 speed?
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Fabian Schlieper

commented on a video on YouTube.
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Are you running on USB1.1? The RPI USB 2.0 implementation does not work well with full-duplex.
To switch to USB1.1, add dwc_otg.speed=1 to /boot/cmdline.txt.
However, at least the UCA202 I have tested, does not work with USB1.1.

The only sound card that works on USB1.1 and has stereo line-in I found so far is LogiLink UA0099
http://www.logilink.eu/showproduct/UA0099.htm?seticlanguage=en
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Eneas Castán's profile photo
 
Thanks for your comment. Finally I found the solution. I'm working with USB1.1 and the UCA 222 with dwc_otg.speed=1 in cmdline.txt and work's fine. :-D 
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