I just purchased a Kingston HyperX Amp USB soundcard[1]. The microphone input
does not work correctly in Alsa, though it is listed as a capture device.

$ arecord -l
card 1: Amp [HyperX Amp], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

When I try to choose it with alsamixer I get an error:

$ alsamixer -c 1
cannot load mixer controls: Invalid argument

This is on Debian Sid with Linux 5.4
$ uname -a
Linux fireball 5.4.0-trunk-amd64 #1 SMP Debian 5.4.2-1~exp1
(2019-12-05) x86_64 GNU/Linux

$ lsusb
Bus 001 Device 010: ID 0951:16d8 Kingston Technology HyperX Amp

I am not sure how to debug the problem further, but I would appreciate any

Thanks, Jesse

[1]: https://www.hyperxgaming.com/us/headsets/accessories

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