[Jack-Devel] Using USB sound card with Jack
John Rigg
j at jrigg.co.uk
Mon Jan 29 10:34:21 CET 2018
On Sun, Jan 28, 2018 at 03:34:08PM +0000, Benny Alexandar wrote:
> Now, I connected USB sound card and it shows the sound card as follows,
>
> cat /proc/asound/cards
> 0 [PCH ]: HDA-Intel - HDA Intel PCH
> HDA Intel PCH at 0xf7d30000 irq 35
> 1 [HD ]: USB-Audio - USB Sound Blaster HD
> Creative Technology USB Sound Blaster HD at usb-0000:00:14.0-2, full speed
>
> After starting jack server using qjackctl, opened terminal and
> ran the following cmd
>
> $zita-a2j -d hw:HD -p 1056 -v
>
> Then in qjackctl connected the graph as shown in the attached picture.
> USB sound card input (line-in) is connected to an audio output from other PC.
> But I can't hear the audio using zita-j2a.
> I mean audio was not heard in PC where zita-j2a is running.
>
> Anything wrong in the connections, how to debug and check why
> no audio is heard.
Starting jackd from the command line is preferable to qjackctl for debugging.
Use jack_connect to make connections.
Use jack_disconnect to break connections.
Use jack_lsp to show existing jack connections.
Read man pages:
man jackd
man jack_connect
man jack_disconnect
man jack_lsp
John
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