Hey,
I've got a Phonic Helix Board 12 Universal USB/FireWire Mixer
(combination of analog mixer + multitrack soundcard). After performing a
firmware upgrade, the kernel happily loads the USB Audio Class 2.0
interface driver for it. I can select it for recording in Ardour, but
all recordings are completely silent (playback works perfectly fine).
Since the device also has a FireWire port, I tried the FireWire
connection: Recordings work flawlessly. I'm using ALSA drivers from
Linux 4.17.3.
Does anybody have experience with this device or similar behavior?
I reported this as a kernel bug some time ago at
https://bugzilla.kernel.org/show_bug.cgi?id=199791 where you can also
find lsusb output and information from /proc/asound/card2/stream0. If
needed, I can also provide Wireshark traces from Windows (=working) and
Linux (=recording silent).
Thank You,
Andreas
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