Почему в Skype при указании выхода "default device" рваный звук?

$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
default
Playback/recording through the PulseAudio sound server
sysdefault:CARD=FM801AU
ForteMedia FM801-AU, FM801
Default Audio Device
front:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
Front speakers
surround21:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
4.0 Surround output to Front and Rear speakers
surround41:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
iec958:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
Direct sample mixing device
dsnoop:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
Direct sample snooping device
hw:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
Direct hardware device without any conversions
plughw:CARD=FM801AU,DEV=0
ForteMedia FM801-AU, FM801
Hardware device with all software conversions

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: FM801AU [ForteMedia FM801-AU], device 0: FM801 [FM801]
Subdevices: 1/1
Subdevice #0: subdevice #0

# cat /proc/asound/cards
0 [FM801AU ]: FM801 - ForteMedia FM801-AU
ForteMedia FM801-AU at 0xe800, irq 20
1 [Camera ]: USB-Audio - Vega USB 2.0 Camera.
Vimicro Corp. Vega USB 2.0 Camera. at usb-0000:00:12.2-2, high speed