[PlanetCCRMA] jack and a soundcard

[sevol]

On 8/11/09, Bozelos Dimitris <dbozelos at yahoo.gr> wrote:
> hello everyone,
>
> I run jack in a terminal using the command
>
> jackd -R -d alsa -r 48000
>
> when using the internal soundcard of my laptop it works fine but when I use
> an external soundcard (Edirol UA-25) although it runs without displaying an
> error the actual sample rate is 44100. I say so because when I try to run
> ChucK with 48000kHz I get a message that it can't run because jack is 44100
> and also if I run qjackctl it displays jack as running with 44100. Any ideas
> what the problem might be?
>
> Cheers,
>
> Dimitris
>
To start, I don't have an Edirol UA-25 (or any usb audio interface),
so I'm only guessing. Did you see the guide? - here:
http://alsa.opensrc.org/index.php/Edirol_UA-25

It says the UA-25 sample rate can only be controlled via the hardware
buttons. & the native sample rate is 44.1 Khz:

----------------------------------------------------------------------------------------------------
On the back pane of the UA-25, there is a switch button called "SAMPLE
RATE". The switch has three values: 44.1 Khz, 48 Khz and 96 Khz:

    * In Advance mode OFF, the device will always record/play natively
at the rate of 44.1 Khz using 16 bits.

    * In Advance mode ON, the device will be able to record using 24
bits. Choose the sample rate using the SAMPLE RATE switch
----------------------------------------------------------------------------------------------------

Seems like the hardware ADVANCE MODE switch is OFF, so in that state,
the sample rate will always be 44.1 Khz & both jack & qjackctl are
matching the current hardware sample rate.

But if I'm not telling you anything new, I don't have a clue.

-sevol