[alsa-devel] Roland V-Studio 20

Clemens Ladisch clemens at ladisch.de
Fri Feb 14 20:07:56 CET 2014

Keith A. Milner wrote:
> I've recently picked up a cheap Roland V-Studio 20 device. This is described
> in the product spec as supporting 24-bit, but it is appearing as 16-bit only.

How does it appear in /proc/asound/card*/stream0?

> Unfortunately, Roland seem to insist on their own proprietary descriptors,
> which I don't know how to decode, so I'm not sure whether this is genuinely a
> 24-bit interface that isn't being interpreted properly by snd-usb-audio, or
> whether it's marketing spin, and it's actually 16-bit.

> ** UNRECOGNIZED:  0b 24 02 01 02 03 18 01 44 ac 00
                                   ^^ ^^
                                   This is three bytes, 24 bits.


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