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I'm running Stretch on an RPi 3 B+. I have a C-Media USB sound card showing up as:

card 1: Device [USB Audio Device], device 0: USB Audio [USB Audio]

and ALSA recognises it as the default card

speaker-test -c2 

plays sound through the card , no problem, as does

speaker-test -Dhw:1 -c2

But trying to start jackd (jackdmp version 1.9.11) with

jackd -P75 -dalsa -dhw:1 -p1024 -n3 -s -r44100

gives the following error:

ALSA: poll time out, polled for 34828042 usecs
JackAudioDriver::ProcessAsync: read error, stopping...

Any ideas as to how to get jackd working on the 3 B+ ?

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