Hello, all--
I have a brand new Denon MCX8000 DJ controller which I would like to use
with Mixxx (open source DJ software) on my Linux laptop. If you're not
familiar with DJ controllers, it's basically a MIDI controller that
includes its own sound card. Denon does not publish detailed specs for the
sound card, but it is a 24-bit, 44100k, USB 2.0 audio device. And since
this particular controller can run standalone (i.e. unconnected to any
computer), I have determined that the sound card works - that is, it plays
music and sounds fine.
However, I am having trouble getting the sound working with Linux. My
system is a Lenovo Thinkpad T410 running 64-bit Manjaro Linux, with all
packages updated last night - so I have version 1.1.3 of alsa-lib and
alsa-utils.
Here's what I'm finding:
aplay -l
....
card 1: MCX8000 [DENON DJ MCX8000], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
aplay -L
....
default:CARD=MCX8000
DENON DJ MCX8000, USB Audio
Default Audio Device
sysdefault:CARD=MCX8000
DENON DJ MCX8000, USB Audio
Default Audio Device
....
[additional entries for various values of surroundNN]
When I run alsamixer, DENON DJ MCX8000 is one of the sound cards I can
select; when I do select it, the results depend on the kernel version. With
older kernels, no playback or capture devices are shown for this card; with
a 4.9 or 4.10 kernel, a single playback device is shown:
MULTI Validity
However, the info at the top of the screen says it is [Off], and in the
center of screen where a volume slider might be, MM is displayed - meaning
"muted," I suppose. And there does not seem to be any way to change the
state of that control.
Finally, the crux of the matter. When I run Mixxx and attempt to select the
MCX8000 as the output device, the GUI pops up an "unknown error" message.
But when I run Mixxx in debug mode, I am able to capture following more
detailed error:
Debug [Main]: Opening stream with id 4
Expression 'r' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2092
Expression 'PaAlsaStreamComponent_FinishConfigure( &self->playback,
hwParamsPlayback, outParams, self->primeBuffers, realSr, outputLatency )'
failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2733
Expression 'PaAlsaStream_Configure( stream, inputParameters,
outputParameters, sampleRate, framesPerBuffer, &inputLatency,
&outputLatency, &hostBufferSizeMode )' failed in
'src/hostapi/alsa/pa_linux_alsa.c', line: 2838
Warning [Main]: Error opening stream: Unanticipated host error
So, is anyone able to understand what the issue is here? Is there any hope
of getting this soundcard working? Any suggestions for additional
troubleshooting?
Thanks in advance for any insights.
--
Caelia Chapin
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