ho un USB Headset con Virtual surround 7.1 di cui dovrei abilitare tutti e 8 i canali...però essendo USB viene visto da Pulse Audio come normali cuffie stereo...

modificare /etc/pulse/daemon.conf in default-sample-channels = 8 non ha dato risultati

La distro su cui ho il problema è Ubuntu 16.04.2 LTS x86_64 con Desktop Unity...

name: 
driver: 
owner module: 7
properties:
alsa.card = "2"
alsa.card_name = "Turtle Beach Z60 Game Audio"
alsa.long_card_name = "Turtle Beach Turtle Beach Z60 Game Audio at usb-0000:00:14.0-7, full speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:00:14.0-usb-0:7:1.0"
sysfs.path = "/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/sound/card2"
udev.id = "usb-Turtle_Beach_Turtle_Beach_Z60_Game_Audio_000000000000-00"
device.bus = "usb"
device.vendor.id = "10f5"
device.vendor.name = "Turtle Beach"
device.product.id = "2129"
device.product.name = "Turtle Beach Z60 Game Audio"
device.serial = "Turtle_Beach_Turtle_Beach_Z60_Game_Audio_000000000000"
device.string = "2"
device.description = "Turtle Beach Z60 Game Audio"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-usb"
profiles:
input:analog-stereo: Stereo analogico input (priority 10, available: unknown)
input:iec958-stereo: Stereo digitale (IEC958) input (priority 5, available: unknown)
output:analog-stereo: Stereo analogico output (priority 1000, available: unknown)
output:analog-stereo+input:analog-stereo: Duplex stereo analogico (priority 1010, available: unknown)
output:analog-stereo+input:iec958-stereo: Stereo analogico output +  Stereo digitale (IEC958) input (priority 1005, available: unknown)
output:iec958-stereo: Stereo digitale (IEC958) output (priority 500, available: unknown)
output:iec958-stereo+input:analog-stereo: Stereo digitale (IEC958)  output + Stereo analogico input (priority 510, available: unknown)
output:iec958-stereo+input:iec958-stereo: Duplex stereo digitale (IEC958) (priority 505, available: unknown)
off: Spento (priority 0, available: unknown)
active profile: 
sinks:
alsa_output.usb-Turtle_Beach_Turtle_Beach_Z60_Game_Audio_000000000000-00.iec958-stereo/#1:  Turtle Beach Z60 Game Audio Stereo digitale (IEC958)
sources:
alsa_output.usb-Turtle_Beach_Turtle_Beach_Z60_Game_Audio_000000000000-00.iec958-stereo.monitor/#1:  Monitor of Turtle Beach Z60 Game Audio Stereo digitale (IEC958)
alsa_input.usb-Turtle_Beach_Turtle_Beach_Z60_Game_Audio_000000000000-00.iec958-stereo/#2:  Turtle Beach Z60 Game Audio Stereo digitale (IEC958)