Hello,
hopefully I get help here and can also assist in fixing and testing the
Roland UA-55 aka QUADCAPTURE device.
I run Linux since years and I'm glad that many hardware is supported
now. Also many people say that the support for older devices is better
with Linux than with other systems. May be?
As a musician and also as an high fidelity user I was glad to find this
Roland device on a used market but was surprised, that it is not really
supported on Linux. At linuxmusicians.org you can find a main discussion
that is some (a lot) of years old and there seems to be nobody at the
moment who tries to support this device better than years ago.
https://linuxmusicians.com/viewtopic.php?f=6&t=10435
But to my surprise, last year there has been a fix in a special use case
of some Roland devices, also for the UA-55. See this link:
https://mailman.alsa-project.org/pipermail/alsa-devel/2021-March/182929.html
But still it seams, that based on an old commit of Clemens Ladisch on
June,27th, 2013 in quirks-table.h this device is limited to 44.1 kHz.
See
https://github.com/torvalds/linux/blob/master/sound/usb/quirks-table.h#L1623
The commit message was
The Roland Quad/Octo-Capture devices use some unknown vendor-specific
mechanism to switch sample rates (and to manage other controls). To
prevent the driver from attempting to use any other than the default
44.1 kHz sample rate, use quirks to hide the other alternate settings.
But that's really a shame, because the device can support up to 192 kHz
and is the only one I know in this pricing that also has Ground Lift
feature.
I have written an email to Clemens but did not get any response jet and
at the moment I think this mailing list is a better place for my
problem. But Clemens might remember more details about the core problem.
Also it might be that Roland itself now gives technical documentation to
us because they do not sell this device any more.
So is there a chance to get help here from some developers?
Regards
Frank
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