jackd starting and RT Kernel for Wolfson

[puredyne]

[cmh714]

for volume, ssh in and run alsamixer. the volume could be set too low or muted totally.

F6 chooses the sound card, arrows for volume and the "M" key for mute/unmute.

not sure I can help on the jackd, but have used it before on ap-linux

[Midnight]

For audio playback you won't need low latency. So you neither need a RT kernel, nor 1000 Hz.

[puredyne]

[Midnight]

I respect your opinion, but tell me more about these magic kernel facts

[puredyne]

are the same similar problems of a cd player, windows, osx, etc ... with the samples you can hear everything!
theories do not make sense. linux audio exists and it sounds better than records and tapes for over 10 years. not like or worse.

[ACX]

Hi everyone,
I suggest you to take a look at the following interesting resources before starting a flame

About the real need of a RT kernel:
https://wiki.archlinux.org/index.php/Pr ... ime_Kernel
http://jackaudio.org/faq/realtime_vs_re ... ernel.html

About the real need of JACK in a simple playback application without multiple streams mixing:
http://wiki.gentoo.org/wiki/ALSA#JACK_A ... ection_Kit

Anyway, @puredyne: if you want to experiment a RT setup with JACK we'll be pleased if you decide to share your results with us. MPD already has JACK input plugin enabled since RuneAudio 0.1-beta.

About the 1000Hz issue, we have to check it (soon we'll publish all the configs).

[puredyne]

Today, many are hoping to overcome the jitter problems with asynchronous technologies.

At the time... I lost the motivation to continue to spend time and money with USB.

I'm most interested to try a direct I2S connection.

I only found this old analysis: http://www.nexthardware.com/forum/cmp2- ... zioni.html

[ACX]

[puredyne]

OK, thank you for all the answers and the interesting links!

So I would start with the preparation of linear power supplies... and thinking on how to separate the sound card.

If someone could tell me on how to be able to start Jack, I'd like that. How I would love to see jack sample parameters.

A sentence of the last article sent me into paranoia.

"Possiedo un ricevitore con 200 ps di jitter che suona molto meglio di un altro con 50 ps, MA la loro risposta in frequenza è molto diversa.Quindi scegliere il valore di targa di jitter più basso non è garanzia automatica di suono migliore."

50 ps? I can think only of the Wolfson's transceiver.