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Stars

Member

Registered: 2008-05-13

Posts: 2

help with ALSA setup

hi! I have an E-MU 0202 USB audio interface and I am using the latest ALSA drivers:

stars@Planetshine$ pacman -Q | grep alsa
alsa-lib 1.0.22-1
alsa-oss 1.0.17-1
alsa-utils 1.0.22-2

however, alsa does not seem to see all of the channels: (there is a headphone jack, three speaker jacks, and three input jacks)

stars@Planetshine$ amixer 
Simple mixer control 'PCM',0
  Capabilities: pvolume pswitch pswitch-joined penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 200
  Mono:
  Front Left: Playback 0 [0%] [0.00dB] [off]
  Front Right: Playback 0 [0%] [0.00dB] [off]
Simple mixer control 'Extension Unit',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [off]

stars@Planetshine$ aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
front:CARD=USB,DEV=0
    E-MU 0202 
    Front speakers
surround40:CARD=USB,DEV=0
    E-MU 0202 
    4.0 Surround output to Front and Rear speakers
surround41:CARD=USB,DEV=0
    E-MU 0202 
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=USB,DEV=0
    E-MU 0202 
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=USB,DEV=0
    E-MU 0202 
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=USB,DEV=0
    E-MU 0202 
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=USB,DEV=0
    E-MU 0202 
    IEC958 (S/PDIF) Digital Audio Output

also, the two channels shown there don't actually control the volume at all, or anything (even if I mute them sound still plays). (also aside from this everything works fine~)

would there be a way to control the volume of each jack (headphones, right/left speaker jacks, etc etc) from ALSA?

also, on an unrelated note, the sound is scratchy when I explicitly use ALSA and seems to work fine with OSS, although sometimes for both it doesn't play at all, has anyone else had this problem?

thanks!

antlechrist

Member

Registered: 2010-04-21

Posts: 26

Re: help with ALSA setup

Have you tried alsamixer and pressing 'm' to unmute on all channels?

Stars

Member

Registered: 2008-05-13

Posts: 2

Re: help with ALSA setup

yes, the channels don't actually work (they have no effect on how loud sounds are)

antlechrist

Member

Registered: 2010-04-21

Posts: 26

Re: help with ALSA setup

http://www.linuxmusicians.com/viewtopic.php?f=6&t=914
https://bugtrack.alsa-project.org/wiki/ … comments=1
http://git.alsa-project.org/?p=alsa-fir … e4;hb=HEAD

Supposedly the 0202 works, but requires alsa-firmware in extra. You might also need alsa-tools... The AUR package might work, or install from source. Hopefully these links will point you in the right direction. Good luck getting it working. Here's what I did to get my Tascam US-428 working:

http://andrew.antlechrist.org/posts/201 … linux.html

Macdelaney

Member

Registered: 2008-11-24

Posts: 24

Re: help with ALSA setup

Did you manage to get everything going well?