those emulated sigmatel ac97 codec inside virtualbox 4.x support stereo
only
which host os are you using linux/windows ?
do you have a real sound card support 5.1 ?
which audio backend do your virtualbox5.0 using ?
it seem that the emulated ad1980 ac97 support multi channel
profiles:
input:analog-stereo: Analog Stereo Input (priority 60,
available: unknown)
output:analog-stereo: Analog Stereo Output (priority 6000,
available: unknown)
output:analog-stereo+input:analog-stereo: Analog Stereo Duplex
(priority 6060, available: unknown)
output:analog-surround-21: Analog Surround 2.1 Output (priority
800, available: unknown)
output:analog-surround-21+input:analog-stereo: Analog Surround
2.1 Output + Analog Stereo Input (priority 860, available: unknown)
output:analog-surround-40: Analog Surround 4.0 Output (priority
700, available: unknown)
output:analog-surround-40+input:analog-stereo: Analog Surround
4.0 Output + Analog Stereo Input (priority 760, available: unknown)
output:analog-surround-41: Analog Surround 4.1 Output (priority
800, available: unknown)
output:analog-surround-41+input:analog-stereo: Analog Surround
4.1 Output + Analog Stereo Input (priority 860, available: unknown)
output:analog-surround-50: Analog Surround 5.0 Output (priority
700, available: unknown)
output:analog-surround-50+input:analog-stereo: Analog Surround
5.0 Output + Analog Stereo Input (priority 760, available: unknown)
output:analog-surround-51: Analog Surround 5.1 Output (priority
800, available: unknown)
output:analog-surround-51+input:analog-stereo: Analog Surround
5.1 Output + Analog Stereo Input (priority 860, available: unknown)
off: Off (priority 0, available: unknown)
active profile: <output:analog-stereo+input:analog-stereo>
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https://bugs.launchpad.net/bugs/1487168
Title:
[Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider
problem
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