Re: [LAU] Recommended soundcard

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To: Ralf Mardorf <ralf.mardorf@...>
Cc: <Linux-audio-user@...>
Date: Saturday, December 22, 2012 - 4:23 pm

Hi Ralf,

you are right, I should have been a bit more precise. First of all, it
is not my ff ucx, I was lucky that I could borrow one from a friend
for two weeks. During that time, I managed to get help from the ALSA
community and fix mixer.c and at the end of that two week period, I
could do some testing. Right now, I do not have access to a ucx and
can not do further testing but I think I will get my own device after
xmas. I hope that I can do proper testing then and send a "report".

My tests so far included the following:

As I already mentioned, I only used the class-compliance mode. Up to
my knowledge, usb-audio 2.0 is limited to 8/8 in/out-channels and
sample rates up to 96 kHz. ALSA driver recognizes these 8/8 channels.
The device moreover appears in the JACK-setup and I was to start
JACK-server running 8/8 channels with sample rates up to 96 kHz. I
played back soundfiles through the ucx without any problems. I
moreover send sine-signals with different frequencies from
supercollider to all the 8 channels and these correctly appeared at
the 8 jack-outputs (which are on the backside of the device). Finally,
I made loopback recordings from pulses, sine-waves and triangular
waves also using supercollider and different jack blocksizes / sample
rates. The latency I read from the pulse-loopback records was 7 to 8
ms (blocksize: 64, samplerate: 42100/s). The sine- and
triangular-loopback-recordings show clean signals, only a very close
analysis of the triangular signals shows a slight distortion but this
also appeared when the card was connected to a mac computer using
RME's proprietary driver. Maybe the cause was actually the capacitance
of the low quality cables used for the loopback, I don't know.

I certainly did not test all the features of the ucx, it is not
possible to access all of the channels and I also do not know how to
access TotalMix and the build-in DSP-features, most likely it is
impossible in the class-compliant mode.

I hope this description is somehow clear,



Quoting Ralf Mardorf :

> On Sat, 2012-12-22 at 13:20 +0100, Florian Hanisch wrote:

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Messages in current thread:
[LAU] Recommended soundcard, Tim Humphrey, (Thu Dec 20, 1:48 am)
Re: [LAU] Recommended soundcard, Dan MacDonald, (Thu Dec 20, 9:25 am)
Re: [LAU] Recommended soundcard, Florian Hanisch, (Sat Dec 22, 12:20 pm)
Re: [LAU] Recommended soundcard, Ralf Mardorf, (Sat Dec 22, 2:03 pm)
Re: [LAU] Recommended soundcard, Florian Hanisch, (Sat Dec 22, 4:23 pm)
Re: [LAU] Recommended soundcard, Michal Seta, (Fri Dec 21, 11:52 pm)
Re: [LAU] Recommended soundcard, Moshe Werner, (Thu Dec 20, 7:12 am)
Re: [LAU] Recommended soundcard, Brett McCoy, (Thu Dec 20, 2:04 am)
Re: [LAU] Recommended soundcard, Ralf Mardorf, (Thu Dec 20, 2:40 am)
Re: [LAU] Recommended soundcard, Brent Busby, (Thu Dec 20, 2:49 am)