On 12/20/20 11:45 PM, Ben Koenig wrote:
On 12/20/20 9:58 PM, Dick Steffens wrote:
On 12/20/20 9:42 PM, Bill Barry wrote:
On Sun, Dec 20, 2020, 11:34 PM Dick Steffens <[email protected]>
wrote
With the turntable unplugged PulseAudio sees a port labeled Line Out
(plugged in). When I plug in the turntable it adds a section for
PCM2900
Audio Codec Analog Stereo in a port labeled Analog Output. The Line
Out
(plugged in) section is still there. BTW, I also tried powering up the
turntable, but it had no effect.
Now my question is, is there a way to change the behavior?
What happens in the Configuration tab of PulseAudio control when you
connect and disconnect the turntable?
It starts with two sections labeled Built-in Audio. One of them says
Profile: Off, and the other says Profile: Analog Stereo Duplex.
When I connect the turntable a third section appears labeled PCM2900.
It says Profile: Analog Stereo Duplex.
Clicking on the down-arrow provides a list of options, some input and
some output. If I select Off, the sound returns to the speakers.
Sound remains playing through the speakers when I select Analog
Stereo Input, or Digital Stereo (IEC958) Input. I assume, coming
through USB, the latter is the one I'll want for recording an LP.
This may solve the problem. Just to see, I left the USB cable plugged
in and restarted the machine. When it came up, PCM Audio Codec still
had a profile Digital Stereo (IEC958) Input.
So maybe it just needed to be told what I want it to be and will keep
that going forward? Hope, hope.
By selecting "Off" for the Built-in Audio profile you effectively
disabled your built-in motherboard sound chip. You basically told
Pulseaudio to not include that device in the list of available audio
devices which results in it selecting the next audio device down the
list when an application starts playing sound.
This also explains why it worked when you selected "Analog Stereo
input" and "Digital Stereo (IEC958) Input". Both of those options tell
Pulseaudio that your card is to be used for input ONLY so it never
shows as an output device. Since the problem was audio not playing
through the correct device setting the device to input only has the
same effect as turning it off.
You can achieve the same result by changing your default sound device
to whatever your speakers are plugged into. You'll also need to check
the application's stream and make sure it is using the "default" since
pulse allows individual apps to play through a different card if told
to do so.
Thanks. That's a "sound" explanation of what I discovered. It makes
sense, and I'll remember it when I swap ENU1 and ENU2 (once I've
installed Xubuntu 20.04.1 on ENU1 and transferred all the important data
to it from ENU2), since the turntable will stay with the desk it's on
and ENU2 will likely have the same problem when I first plug the
turntable in.
--
Regards,
Dick Steffens
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