On Wed, May 28, 2014 at 9:47 AM, Cristiano Alessandro
<[email protected]> wrote:
> $ cat /proc/asound/cards
>
>  0 [Intel          ]: HDA-Intel - HDA Intel
>                       HDA Intel at 0xfcaf4000 irq 46
>  1 [NVidia         ]: HDA-Intel - HDA NVidia
>                       HDA NVidia at 0xfeafc000 irq 17
>  2 [PODHD300       ]: line6usb - POD HD300
>                       Line6 POD HD300 at USB 8-2:1.0

Great, the driver is working and the sound card is available.

First, launch pavucontrol and disable the HD300 in the Configuration
tab.  This ensures that PulseAudio will not interfere while JACK is
using the device.

If you wish to hear the guitar on your PC speakers, also disable your
PC sound card in pavucontrol.

Now launch qjackctl.  If you want to use the HD300 for playback and
capture, select HD300 as the Interface and make sure Audio is Duplex.
Set Frames/Period to 128, Sample Rate to 48000, and Periods/Buffer to
2.  Now click click Start to launch the JACK daemon.  This is the
configuration that I use.

But it sounds like you want to use the HD300 as the capture (in)
device and your PC soundcard as the playback (out) device.  In that
case you need select the Input Device and Output Device separately.
I'm not sure how great JACK is at using two different sound devices -
the reason is that they have independent sampling clocks which will
drift apart over time.

In my setup where everything goes through the HD300 I connect either
headphones to the HD300's headphone socket or a PA speaker to the
HD300's L/Mono socket.

Hope this helps,
Stefan

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