[LAU] Fireface UCX

[Florian Hanisch]

Hi,

I did not use Alsamixer (and I can not test it right now) so I can not  
say how Alsamixer should look like.

I used the device (sucessfully) in the following two ways:

1) Select device in pulseaudio and play back from youtube or whatever source.

2) Select device in jack and make some sounds from supercollider.  
Here, I could check that I got 8/8 I/O-channels up to 96 kHz sampling  
rate working. This was encouraging enough for me to buy my own UCX.

Actually, a friend told me that he can use more channels in CC-mode  
with the latest firmware BUT connect to a mac-system. I did not test  
whether this is also true for linux, maybe the usb-audio standard does  
not support more than 8/8 channels.

Best,

Florian


Quoting Max <abonnements at revolwear.com>:

> Hi, that sounds promising.
> I have the UCX running in CC mode, and I also see it in the   
> Alsamixer with only one control, the master volume.
> so that part isn't the problem.
> the fix of the alsa /sound/usb/mixer.c is in kernel 3.8 which i have  
>  on the system.

Good to know, thanks!

> http://mailman.alsa-project.org/pipermail/alsa-devel/2013-January/058998.html
>
> however: If i select this device in some alsa software i get   
> horrible crackles (I tried 44100 and 48000 Hz, they both give me   
> different kind of crackles).
>
> What do you do to get useful sound out of it?
>
> Max
>
> Am 07.06.2013 um 01:47 schrieb Florian Hanisch <fhanisch at uni-potsdam.de>:
>
>> Hi,
>>
>> I use the ff ucx via USB. As far as I know, it is not possible to   
>> use it via firewire.
>>
>> I getting reasonable sound results using the usb class compliance   
>> mode, you have to make sure that this mode is enabled on the device  
>>  (it is NOT by default).
>>
>> The ALSA driver then recognizes the device. If you enter
>>
>> aplay -l
>>
>> in a terminal, you get a list with all devices available to alsa.   
>> If it does not appear there, try the comand
>>
>> dmesg
>>
>> to look for error messages of the alsa kernel module. If I do that,  
>>  I find a message
>>
>> usbcore: registered new interface driver snd-usb-audio
>>
>> indicating that the interface is working. Then, the device is   
>> available in pulse-audio and also jack, you can choose it there.
>>
>> I should add the following: My system (and in particular the alsa   
>> kernel module) is not up to date. I am still using an old   
>> customized version, where I fixed a bug by hand (getting help from   
>> the alsa list). As far as I remember, this bug was fixed so that   
>> the device should work with the standard alsa kernel module.   
>> However, I never tested it, maybe I find time to do that during the  
>>  weekend.
>>
>> Best,
>>
>> Florian
>>
>> Quoting Max <abonnements at revolwear.com>:
>>
>>> Is there anyone who is running a Fireface UCX under Linux    
>>> successfully? (either via USB or Firewire)?
>>> It has a USB Class Compliant mode for Audio Device Class 2
>>>
>>> http://www.rme-audio.de/forum/viewtopic.php?pid=86665#p86665
>>>
>>> I get nothing but crackles.
>>>
>>> m.
>