On Sat, 27 Apr 2019 at 14:20:32 -0000, Christian Weisgerber wrote:
> However, as in this example, I think you will only get a few generic
> controls.
> It is my theoretical understanding that USB audio gadgets typically
> come with a uhid(4) device, as does yours above, and you would use
> usbhidctl(1) to list and manipulate the available controls.
> In practice, I only get some variant of
> usbhidctl: USB_GET_REPORT (probably not supported by device): Input/output 
> error
> when I try this.  So either I'm mistaken or there is a problem
> somewhere.

Some devices just don't supply hardware volume controls, so it must 
be done in software on the sending device.

With sndiod, you can use aucatctl to change the software volume 
per-application (or the master volume).

It's all kind of complicated though.  If you plug in a new USB audio 
device like this, you have to restart sndiod and pass in a new 
device name, then use aucatctl to adjust the volume.  But if you 
unplug the USB device, you have to restart sndiod again to use the 
default audio device and use mixerctl instead.

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