I am running Ubuntu 14.04. I am trying to play the output (amplified to
line level) of a turntable through my computer with a volume control
that works. The audio output of the computer is via an Nvidia hdmi to a
surround sound preamp. The input is the analog line in connection of a
Xonar D2 sound card (eventually the D2 will replace the surround sound
preamp). I can play the records with either of the below commands -
built-in:
| pactl load-module module-loopback
|
or, try ecasound:
| sudo apt-get install ecasound
ecasound -i alsa -o alsa
|
but I cannot control the volume. Since I wish to control the volume via
the multimedia volume keys on my keyboard what are the appropriate
command line inputs or script to accomplish this.
Any suggestions would be greatly appreciated. The amixer output for
each sound card is show below.
Sound Card 1, output on Nvidia hdmi
amixer -c 1
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'IEC958',1
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Sound Card 0, input on Line
amixer -c 0
Simple mixer control 'Master',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right - Rear Left - Rear Right
- Front Center - Woofer - Side Left - Side Right
Limits: Playback 135 - 255
Mono:
Front Left: Playback 255 [100%] [0.00dB] [on]
Front Right: Playback 255 [100%] [0.00dB] [on]
Rear Left: Playback 255 [100%] [0.00dB] [on]
Rear Right: Playback 255 [100%] [0.00dB] [on]
Front Center: Playback 255 [100%] [0.00dB] [on]
Woofer: Playback 255 [100%] [0.00dB] [on]
Side Left: Playback 255 [100%] [0.00dB] [on]
Side Right: Playback 255 [100%] [0.00dB] [on]
Simple mixer control 'Line',0
Capabilities: cswitch cswitch-joined
Capture channels: Mono
Mono: Capture [on]
Simple mixer control 'CD',0
Capabilities: cvolume cswitch cswitch-joined
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 23 [74%] [0.00dB] [off]
Front Right: Capture 23 [74%] [0.00dB] [off]
Simple mixer control 'Mic',0
Capabilities: cvolume cvolume-joined cswitch cswitch-joined
Capture channels: Mono
Limits: Capture 0 - 31
Mono: Capture 0 [0%] [-34.50dB] [off]
Simple mixer control 'Mic Boost (+20dB)',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'IEC958 Loopback',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'IEC958 Validity Check',0
Capabilities: cswitch cswitch-joined
Capture channels: Mono
Mono: Capture [off]
Simple mixer control 'Aux',0
Capabilities: cvolume cswitch cswitch-joined
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 0 [0%] [-34.50dB] [off]
Front Right: Capture 0 [0%] [-34.50dB] [off]
Simple mixer control 'Analog Input Monitor',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 1
Mono: Playback 1 [100%] [0.00dB] [off]
Simple mixer control 'Analog Loopback',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'DAC Filter',0
Capabilities: penum
Items: 'Sharp Roll-off' 'Slow Roll-off'
Item0: 'Sharp Roll-off'
Simple mixer control 'Digital Input Monitor',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 1
Mono: Playback 1 [100%] [0.00dB] [off]
Simple mixer control 'Stereo Upmixing',0
Capabilities: enum
Items: 'Front' 'Front+Surround' 'Front+Surround+Back'
Item0: 'Front+Surround'
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