Pulse Audio Sound Levels

[Lanoxx]

On 13/03/13 20:12, Ric Moore wrote:
> On 03/13/2013 02:09 PM, Lanoxx wrote:
>> Hi,
>>
>> I have a sound system from Teufel (Concept C 200) which has a built in
>> USB sound card and an analogue aux input. When I connect the USB cable
>> to my computer and the aux cable to my radio, then the sound of the
>> radio does not play. When I unplug the USB cable the sound from the
>> radio starts playing immediately. I have found out from the hardware
>> manual that the sound card is able to control the aux output and mute it
>> or control the volume. On windows it is possible to simultaneously
>> enable both usb and aux inputs (see [1]). I have not found any way to do
>> the same in Ubuntu so far and I would like to know if this is a bug (or
>> missing feature) in which case I would report it on launchpad, or if I
>> simply haven't found the right option.
>>
>> I have already tried to use alsamixer and pavucontrol. In alsamixer i
>> can see that the usb sound card has separate "speaker" and "line"
>> devices, but changing the volume does not affect the output. In
>> pavucontrol there is simply no way to see the difference between
>> "speaker" and "line" as there is only a single volume control for the
>> usb sound card.
>
> Pulse runs on top of Alsa. IF alsa looks good, then pulse should 
> reflect that. When you run pavucontrol, did you go into the 
> "Configuration" tab and set up the USB sound card? Is it stereo (or 
> 4.0 or 4.1 or 5.0 or 5.1, etc) output and ~no input~?? Then you should 
> be able to set up that aux mike input as well, if ALSA sees it. I'm 
> guessing it would be set to output/none input/"mono", if you have no 
> stereo input.
The volume controller has a mic input which is controlled by the USB 
sound card and works just fine. The problem is just that I cannot use 
aux and usb at the same time. I have to physically unplug the usb cable 
to activate the aux/in and then connect my radio with the speakers.

In pavucontrol in the "Configuration" tab the USB sound card is 
configured as "Analog stereo duplex", but it does not have any effect 
what I choose. The speakers are 2.1 (two satelites and one subwoofer) 
with a special volume control unit that is connected to the subwoofer 
and has a 3.5mm line out and mic input on which I have connected my 
headset and which works just fine. I have already tried all different 
kind of configurations and they had no effect so far. I just appears as 
if the aux input keeps being muted.
>
>  Ric
Regards
Sebastian
>
>