Hello everybody,
i want to use a MixPre-10 II (from Sound Device) to capture multiple microphones (up to 5 or 6) at the same time and analyze the signals on a computer.
The MixPre-10 II is connected via USB-C to a pc running Ubuntu OS and a python script including pyaudio to capture the multiple channels.
The problem is that pavucontrol (and Audacity e.g.) only shows 2 input channels.
The MixPre-10 II is configured correctly, because on a Mac OS every 12 input channels are shown.
'pacmd list-sources' produces the following output:
Code:
* index: 11
name: <alsa_input.usb-Sound_Devices__LLC_MixPre-10_II_TJ0120085001-00.iec958-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 9048
volume: front-left: 65536 / 100% / 0,00 dB, front-right: 65536 / 100% / 0,00 dB
balance 0,00
base volume: 65536 / 100% / 0,00 dB
volume steps: 65537
muted: no
current latency: 0,00 ms
max rewind: 0 KiB
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 0
configured latency: 0,00 ms; range is 0,50 .. 2000,00 ms
card: 6 <alsa_card.usb-Sound_Devices__LLC_MixPre-10_II_TJ0120085001-00>
module: 33
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "USB Audio"
alsa.id = "USB Audio"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "1"
alsa.card_name = "MixPre-10 II"
alsa.long_card_name = "Sound Devices, LLC MixPre-10 II at usb-0000:00:14.0-3, high speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:00:14.0-usb-0:3:1.0"
sysfs.path = "/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/sound/card1"
udev.id = "usb-Sound_Devices__LLC_MixPre-10_II_TJ0120085001-00"
device.bus = "usb"
device.vendor.id = "0926"
device.vendor.name = "Sound Devices, LLC"
device.product.id = "0210"
device.product.name = "MixPre-10 II"
device.serial = "Sound_Devices__LLC_MixPre-10_II_TJ0120085001"
device.string = "iec958:1"
device.buffering.buffer_size = "352800"
device.buffering.fragment_size = "176400"
device.access_mode = "mmap+timer"
device.profile.name = "iec958-stereo"
device.profile.description = "Digital Stereo (IEC958)"
device.description = "MixPre-10 II Digital Stereo (IEC958)"
alsa.mixer_name = "USB Mixer"
alsa.components = "USB0926:0210"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-usb"
ports:
iec958-stereo-input: Digital Input (S/PDIF) (priority 0, latency offset 30000 usec, available: unknown)
properties:
active port: <iec958-stereo-input>
If i change the soundcard to MixPre-10 II in alsamixer, the message "This sound device does not have any controls" appears.
I suspect it has something to do with PulseAudio, but as I have very little experience in this field, I wanted to ask if anyone had a similar problem or has any idea how to face the problem.
Many thanks in advance!
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