On Sat, Apr 27, 2019 at 10:10:07AM -0500, joshua stein wrote:
> 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.

Here's a small aucatctl-like program to control sndiod volume in X:


In the .xinitrc or .xsession add:

        xvolkeys -D

Then, use Ctrl-Alt-Plus and Ctrl-Alt-Minus to increment and decrement
sndiod master volume.

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