Re: [Line6linux-user] HD300 and Jack

[Cristiano A. <cri...@ti...>]

Hi Stefan,

thanks for your reply.
I have followed your suggestions and everything seems to be running. I 
can start the Jack server, and I can even define different audio cards 
for input and output. It works!

However nothing comes out of the speakers. I have checked Alsa mixer and 
all the lines are in maximum volume. I am sure that the signals arrives 
to the PC, because I can record in Ardour and I can see the waveform, 
but I cannot hear anything. Not even if I play the track recorded in Ardour.
Any idea?

Thanks
Cristiano



On 05/28/2014 10:42 AM, Stefan Hajnoczi wrote:
> On Wed, May 28, 2014 at 9:47 AM, Cristiano Alessandro
> <cri...@ti...> wrote:
>
> 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