My situation it's pretty random. I have two soundcards, one cheap on board and another cheap pci. With the on board there's no trouble playing two sound streams at the same time nor any other complication. On Board: 00:07.0 Audio device: nVidia Corporation MCP65 High Definition Audio (rev a1) Subsystem: ASUSTeK Computer Inc. Device 8286 Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 20 Memory at dddf8000 (32-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: HDA Intel Kernel modules: snd-hda-intel But while using the pci card the situation turns random. Some times while playing music with Rhythmbox and watching youtube videos one of them starts to fail and I just hear buzz. Sometimes it works fine. Other times (with Ryhthmbox running and music stoped) when I play videos with VLC I hear no sound at all, but others times it works fine. PCI: 01:06.0 Multimedia audio controller: ESS Technology ES1969 Solo-1 Audiodrive (rev 01) Subsystem: ESS Technology Solo-1 Audio Adapter Flags: bus master, medium devsel, latency 64, IRQ 17 I/O ports at ec00 [size=64] I/O ports at e880 [size=16] I/O ports at e800 [size=16] I/O ports at e480 [size=4] I/O ports at e400 [size=4] Capabilities: <access denied> Kernel driver in use: ESS ES1938 (Solo-1) Kernel modules: snd-es1938 Modules: lsmod | grep snd snd_hda_codec_realtek 206504 1 snd_seq_dummy 2696 0 snd_seq_oss 31168 0 snd_seq_midi_event 7012 1 snd_seq_oss snd_seq 53744 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_pcm_oss 40352 0 snd_hda_intel 26664 0 snd_es1938 19876 2 snd_mixer_oss 17540 1 snd_pcm_oss gameport 11280 2 snd_es1938 snd_hda_codec 71716 2 snd_hda_codec_realtek,snd_hda_intel snd_opl3_lib 10340 1 snd_es1938 snd_mpu401_uart 7524 1 snd_es1938 snd_hwdep 7656 2 snd_hda_codec,snd_opl3_lib snd_rawmidi 21856 1 snd_mpu401_uart snd_pcm 73672 5 snd_pcm_oss,snd_hda_intel,snd_es1938,snd_hda_codec snd_seq_device 6768 5 snd_seq_dummy,snd_seq_oss,snd_seq,snd_opl3_lib,snd_rawmidi snd_timer 21100 3 snd_seq,snd_opl3_lib,snd_pcm snd 58436 19 snd_hda_codec_realtek,snd_seq_oss,snd_seq,snd_pcm_oss,snd_hda_intel,snd_es1938,snd_mixer_oss,snd_hda_codec,snd_opl3_lib,snd_mpu401_uart,snd_hwdep,snd_rawmidi,snd_pcm,snd_seq_device,snd_timer snd_page_alloc 8876 2 snd_hda_intel,snd_pcm soundcore 6848 1 snd