This is a Windows related bug documented by Texas Instruments on their Rev B versions of the PCM29xx USB Sound CODEC.

TI has fixed this issue in PCM29xxC. and later revisions.

On the K3S we are using PCM2901E revision (newer than C). It does not have this problem.

TI's Application Note about this:
http://www.ti.com/lit/an/sbfa020/sbfa020.pdf

73,
Eric
/elecraft.com/
===

On 7/30/2015 7:55 AM, Joe Subich, W4TV wrote:

On 2015-07-30 12:36 AM, TJ Campie wrote:
> Joe, You are correct when the input device has been enumerated as a
> microphone input, which is the bug.

No, enumerating the device as a microphone input is *not a bug* when
the device descriptor specifically identifies the input as microphone.

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