Re: Alsa simultaneous use of usb-sound card - BW problem

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No sync is needed, i only want to use 2 usb sound cards at the same time (different streams, eg: 2 terminal open and i want to make arecord -D plughw:1,0 | aplay -D plughw:1,0 for first usb card and
arecord -D plughw:2,0 | aplay -D plughw:2,0 for second usb sound card. I dont need to create virtual devices, i only want to use these 2 cards at the same time, 

 When i use these cards with different usb buses, it is ok but i need to use them in same bus. The same bus situation results in a problem about bandwidth,i am surprised at seeing the bandwidth error.
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