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,
Best,
Florian
Quoting Ralf Mardorf <ralf.mardorf@xxxxxxxxxxxxx>:
On Sat, 2012-12-22 at 13:20 +0100, Florian Hanisch wrote:
I tested the quality of signals with SuperCollider, I
basically got the quality which is also obtained using RME's driver on
a mac.
@ Florian:
Does Linux support EVERYTHING of your RME card? If you shouldn't have
tested EVERYTHING, please let the OP know what features of the card you
do use.
@ the OP:
Usually it's possible to give the gear back and to get the money back,
if it shouldn't work. Ask your dealer.
Beyond that it's common that professional gear can be tested, seldom by
small business clients, but you should ask. In Germany there btw. is a
law that you can give back things you ordered by the Internet, even
after testing the equipment.
By "testing" I mean real usage, but running test e.g.
jack_midi_latency_test might be helpful too, this already could show
you, if there should be something fishy with the combination of your
mobo and the audio card.
It was my mistake, that I did not "completely test" = use my card, when
I bought it. I was busy and it took a year, before I had the time to use
the card.
Regards,
Ralf
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